Paleobiota of the Latah Formation

The paleobiota of the Latah Formation encompasses both floral and faunal elements preserved in temporary lacustrine environments formed between eruptive phases of the Columbia River Basalts in central to east Eastern Washington and central to north Idaho. The Latah Formation is centered around the greater Spokane area, with a western extent outcropping at Grand Coulee and the eastern margins as far southeast as the area of White Bird, Idaho.[1] Dating of the core Spokane sites is based on the host Grande Ronde Basalts which give an age range of 16.5 to 16.1 million years ago. The Clarkia fossil beds lagerstätte site are slightly younger, being interbedded in the Wanapum Basalts Priest Rapids Member with an age constraint of 16.1 to 15.9 million years ago,[2] or Early Barstovian in age.[3]

The intermittent lakes were surrounded by a temperate ecosystem that was mesophytic in nature, and hosting a diverse flora with plants that are still native to the region and others now restricted to other areas of the globe. There is a small element of the flora that consists of fully extinct genera that are unique to the time and region.[2] Based on work from sampling around Mica, Washington a diverse assembly of diatoms and algae lived in the Spokane area lakes though water conditions for growth were not ideal.[4] The known fauna of the formation is smaller than the flora, with most taxa being insect species[5] though one unnamed Sciuridae fossil was described in 2018,[3] and fish belonging to the salmonid, cyprinid, and centrarchid groups are known.[6] Preservation varies from carbonized compressions at most sites to exceptional organic preservations in some parts of the Clarkia area localities where original organic material is preserved down to living coloration and possible ancient DNA fragments.[7] Upper layers of the Clarkia deposits have been recorded with modern fungi actively feeding on the ancient organic material of the fossils as a food source.[7]

Plants

The initial taxonomic work on the flora was undertaken by Frank Knowlton with assistance from diatom specialist Albert Mann and bryologist Elizabeth Britton.[8] Their combined work was published as a supplemental chapter to the initial 1926 descriptive work by Joseph Pardee and Kirk Bryan. After Knowlton's death in November 1926, his revision of the Latah flora was taken over by Edward W. Berry who also erroneously included strata of the much older Klondike Mountain Formation around Republic, Washington.[9] This error was noted and corrected in later works by Roland W. Brown.[10] Ralph W. Cheney and Daniel I. Axelrod broke the Latah into four major florules, Grand Coulee and Spokane in Washington plus Coeur d'Alene and White Bird in Idaho, while noting several "miscellaneous" sites as well.[1] Modern works have concentrated more on single taxa and certain florules.[2]

Mosses

Family Genus Species Author/year Florule Notes Synonyms Images

Polytrichaceae

Polytrichites

Polytrichites spokanensis[8]

Britton

  • Spokane

A possible polytrichaceous moss

incertae sedis Hypnites

Hypnites brittoniae

(Steere) Miller[11]

  • Spokane

A moss of uncertain affiliation.

Hypnites patens[12]

(Britton) Miller

  • Spokane

A moss of uncertain affiliation

Lycopods

Family Genus Species Author/year Florule Notes Images

Lycopodiaceae

Lycopodium

Lycopodium hesperium[8]

Knowlton

  • Coeur d'Alene

A possible lycopod clubmoss
Treated as a plant of uncertain affinity by Chaney & Axelrod 1959[1]

Ferns

Family Genus Species Author/year Florule Notes Synonyms Images

Blechnaceae

Woodwardia

Woodwardia praeradicans

Berry

  • Spokane

A chain fern species

Equisetaceae

Equisetum

Equisetum alexanderi[10]

Brown

  • Spokane

A horsetail species

Dennstaedtiaceae

Pteridium

Pteridium calabazensis[13]

(Dorf) Graham

  • Misc - Alkali Creek

A Pteridium fern species

Osmundaceae

Osmunda

Osmunda occidentalis[10]

(Berry) Brown

  • Spokane

A royal fern species
Not to be confused with Asplenium occidentale Knowlton (1917)

Woodsiaceae

Woodsia

Woodsia bonseri

Berry

  • Spokane

A cliff fern species

Ginkgos

Family Genus Species Author/year Florule Notes Images

Ginkgoaceae

Ginkgo

Ginkgo adiantoides[8]

(Unger) Heer

  • Clarkia
  • Grand Coulee
  • Spokane

A ginkgo species

Conifers

Family Genus Species Author Florule Notes Synonyms Images
Cupressaceae

Juniperus

Juniperus sabinoides

Ashlee

A juniper species

Metasequoia

Metasequoia occidentalis

A dawn redwood species.

Taxodium

Taxodium dubium

(Sternberg) Heer

  • Clarkia[16]
  • Coeur d'Alene
  • Grand Coulee
  • Spokane[8]
  • White Bird
  • Misc locals

A bald-cypress.

Tetraclinis

Tetraclinis salicornioides var. praedecurrens[18]

(Knowlton) Kvaček & Manchester

  • Grand Coulee[14]
  • Misc-Potlatch (Julietta)
  • Spokane[14]
  • White Bird[14]

A Tetraclinis species.

  • Callitris potlatchensis (1935)
  • Fokienia praedecurrens (1959)
  • Fokieniopsis praedecurrens (1997).[19]
  • Libocedrus praedecurrens (1926)[8]
  • Tetraclinis potlachensis (1997)

Thuja

Thuja dimorpha

(Oliver) Chaney & Axelrod

Pinaceae

Keteleeria

Keteleeria heterophylloides

(Berry) Brown

  • Spokane[9]
  • Misc-Clearwater River[14]

A Keteleeria species.

Pinus

Pinus harneyana

Chaney & Axelrod 1959[1]

  • Spokane

A pine

Pinus wheeleri

Cockerell

A pine

  • Pinus monticolensis p.p.(not Republic specimens)

Tsuga

†"Tsuga latahensis"

Berry

  • Grand Coulee
  • Spokane

First described as a hemlock conescale.[21]
Suggested to be a bud scale in 1937.[10]
Treated as an incertae sedis plant by Chaney & Axelrod (1959).[1]

Taxaceae

Cephalotaxus

Cephalotaxus bonseri[1]

(Knowlton) Cheney & Axelrod

  • Spokane

A yew

Basal dicots

Family Genus Species Author Florule Notes Images

Nymphaeaceae

Nymphaea

Unidentified.[22]

  • Clarkia

A Nymphaea species leaf
Not describable to species

Monocots

Family Genus Species Author Florule Notes Synonyms Images
Araceae

Arisaema

Arisaema hesperia[8]

Knowlton

  • Coeur d'Alene

An Arisaema species.
Has been suggested as a synonym of Liquidambar pachyphyllum[12]

Lysichiton

†"Lysichiton washingtonense"[21]

Berry

  • Grand Coulee

First described as a skunk cabbage.[21]
Later treated as a species of uncertain affinity.[1]

Smilacaceae Smilax

Smilax magna

Chaney

A green briar species

  • Aristolochia White Birdensis Ashlee (1932)
  • Smilax lamarensis non Knowlton nec Berry (1929)

Smilax praelaurifolia[15]

Ashlee

  • Misc

A green briar species

Typhaceae

Typha

Typha lesquereuxi

Cockerell

A cattail species

Unidentified Unidentified

Unidentified

  • Spokane

A poaceous like leaf.
Knowlton did not consider Latah Formation leaves as name-able.

Unidentified

  • Spokane

Possibly a poalean plant
Suggested to be a low-growing "grass"

Magnoliids

Family Genus Species Author Florule Notes Synonyms Images
Lauraceae Machilus

Machilus americana[10]

Brown

  • Spokane

A Machilus species

Machilus asiminoides[10]

Brown

  • Spokane

A Machilus species

Persea

Persea lanceolata[23]

(Berry) Brown

  • Grand Coulee
  • Misc-Clearwater River[14]
  • Misc-Juliaetta[14]
  • Spokane
  • White Bird[14]

An avocado species

Umbellularia

Umbellularia saliciformis[12]

(Knowlton & Cockerell) LaMotte

  • Grand Coulee
  • Spokane

A pepperwood species.

  • Laurus similis non Knowlton nec Berry, (1929)
  • Leguminosites bonseri Berry, 1929 (1929)
  • Quercus simulata non Knowlton nec Berry, (1929)
  • Umbellularia dayana non Knowlton nec Brown (1937)
Magnoliaceae

Liriodendron

Liriodendron hesperia[24]

Berry

  • Clarkia
  • Spokane
  • White Bird

A tulip tree species

Magnolia

Magnolia dayana

Cockerell

A magnolia species

Magnolia latahensis[10]

(Berry) Brown

  • Spokane

A magnolia species

Ceratophyllales

Family Genus Species Author Florule Notes Images

Ceratophyllaceae

Ceratophyllum

†"Ceratophyllum praedemersum"

Ashlee

  • Spokane

First described as a Ceratophyllum
Reidentified as a possible immature platanaceous fruiting axis.[25]

Basal eudicots

Family Genus Species Author Florule Notes Synonyms Images

Berberidaceae

Mahonia

Mahonia simplex

(Newberry) Arnold

An oregon grape species.

Platanaceae Platanus

Platanus dissecta

Lesquereux

A Platanus subg. Platanus sycamore leaf species.[26]

Platanus emryi[26]

Huegele, Spielbauer, & Manchester

  • Emerald Creek

A Platanus subg. Platanus sycamore fruit species.

Trochodendraceae

Trochodendron

Trochodendron rosayi[27]

Manchester, Pigg, & DeVore

  • Emerald Creek

A Trochodendron fruit species.

?Trochodendraceae

Nordenskioldia

Nordenskioldia interglacialis[28]

(Hollick) Manchester, Crane, & Dilcher

A stem-group trochodendralean fruit species.
Likely fruits of the leaf species Zizyphoides auriculata

  • Carpites interglacialis (1952)
  • Carpites menthoides (1926)
  • "Equisetum underground stems" (1926)
  • Malva? hesperia (1926)
  • Phyllites amplexicaulis (1926)

Zizyphoides

Zizyphoides auriculata

(Heer) Manchester, Crane, & Dilcher

A stem-group trochodendralean leaf species.
Likely fruits of the fruit species Nordenskioldia interglacialis

Superasterids - basal

Family Genus Species Author Florule Notes Synonyms Images
Cornaceae Cornus

Cornus becki

Berry

  • Grand Coulee

A dogwood species.

Cornus latahense[1]

Chaney and Axelrod

  • Spokane

A dogwood species.

Ebenaceae

Diospyros

Diospyros oregoniana[1]

(Lesquereux) Chaney & Axelrod

  • Grand Coulee
  • Spokane
  • White Bird

A persimmon species

  • Diospyros andersonae (1926)

Remberella [2]

Remberella microcalyx[9]

(Knowlton) Manchester & Judd, 2024

  • Clarkia
  • Emerald Creek
  • Spokane
  • Misc-Oviatt Creek

A probable ebenaceous flower.

  • Porana microcalyx (1929)
  • Diospyros? microcalyx (1926)
Ericaceae

Arctostaphylos

Arctostaphylos spatulata[9]

Berry

  • Spokane

A manzanita species
Deemed incertae sedis without commentary (1959)[1]

Gaultheria

Gaultheria pacifica[23]

Brown

  • Spokane-Brickyard

A Gaultheria species

Juddicarpon

Juddicarpon benewahensis[29]

Smith & Manchester

  • Clarkia

A vaccinioid fruit.

Kalmia?

Kalmia (?) elongata[15]

Ashlee

  • Misc-Elk River

A Kalmia species

Rhododendron

Rhododendron knowltoni[9]

Berry

  • Spokane

A Rhododendron species

  • Menziesia knowltoni (1929)
Vaccinium

Vaccinium bonseri

Berry

  • Spokane

A Vaccinium species
One named subspecies/variety V. b. serrulatum

Vaccinium sophoroides

Knowlton

  • Coeur d'Alene

First named as a huckleberry leaf species
Synonymized into Vaccinium americanum (1929)[9]
Resurrected as incertae sedis (1959)[1]

Vaccinium sophoroides

(Knowlton) Brown

A Vaccinium species

Hydrangeaceae

Hydrangea

Hydrangea knowltoni

(Berry) Chaney & Axelrod

A hydrangea species

Philadelphus

Philadelphus pardeei[10]

(Knowlton) Brown

  • Spokane

A mock-orange species

  • Phyllites pardeei (1926)
  • Phyllites peculiaris (1926)

Loasaceae

Mentzelia

Mentzelia occidentalis

(Berry) Brown

A stickleaf species

  • Hibiscus? occidentalis (1929)
Nyssaceae Nyssa

Nyssa hesperia[21]

Berry

  • Grand Coulee
  • Misc-Linson Valley[14]
  • Spokane
  • White Bird[14]

A tuplo species of the N. sylvatica complex.[30]

Nyssa magnifica

(Knowlton) Berry

  • Grand Coulee
  • Spokane

A tuplo species of the N. javanica complex.[30]

  • Carpites magnifica (1926)
Oleaceae Fraxinus

Fraxinus dayana[1]

Chaney & Axelrod

  • White Bird

An ash species.

Fraxinus idahoensis

Brown

A ash species.

Styracaceae

Halesia

Halesia columbiana[23]

Brown

  • Spokane-Brickyard

A silverbell fruit species

Theaceae

Gordonia

Gordonia idahoensis[1]

(Knowlton) Berry

A Gordonia species.

  • Arbutus idahoensis (1937)
  • Carpites paulownia (1926)
  • Celastrus spokanensis (1929)
  • Gordonia hesperia (1929) p. p.
  • Laurus grandis of Knowlton 1926 p. p.
  • Laurus princeps of Berry 1929
  • Myrica? idahoensis (1898)
  • Myrica lanceolata p. p.

Superasterids

Family Genus Species Author Florule Notes Synonyms Images
Adoxaceae Viburnum

Viburnum fernquisti[9]

Berry

  • Coeur d'Alene
  • Grand Coulee
  • Spokane

A Viburnum seed morphospecies.

Viburnum lantanafolium[9]

Berry

  • Spokane

A Viburnum species.

  • Aesculus hesperia (1929)
  • Rhamnus idahoensis p. p.

Viburnum ribesiforme

LaMotte

  • Coeur d'Alene
  • Grand Coulee
  • Spokane

A Viburnum species.

  • Ribes fernquisti (1929)[9]
  • Viburnum fernquisti of Brown 1937

Apiaceae

Umbelliferospermum

Umbelliferospermum latahense[9]

Berry

  • Spokane

An apiaceous winged fruit morphogenus.[31]

Aquifoliaceae

Ilex

Ilex fulva[1]

MacGinitie

  • Spokane

A holly species.

Superrosids - Basal

Family Genus Species Author Florule Notes Synonyms Images

Altingiaceae

Liquidambar

Liquidambar pachyphyllum

Knowlton

A sweet gum species.

  • Arisaema hesperia (1926)?

Hamamelidaceae

Exbucklandia

Exbucklandia oregonensis

(Chaney) Brown

An Exbucklandia species

  • Cercus spokanensis non Knowlton nec Brown (1937) p.p.[10]
  • Ficus washingtonensis Knowlton (1926)[8]
  • Meibomites lucens Knowlton (1926)[8]
  • Meibomites knowltoni Berry (1929)[9]
Vitaceae Vitis

Vitis bonseri

Berry

A grape species.

Vitis washingtonensis

(Knowlton) Brown

A grape species.

Superrosids - Fabids

Family Genus Species Author Florule Notes Synonyms Images
Betulaceae Alnus

Alnus fairii

(Knowlton) Wolfe[34]

An alder.

Alnus largei

(Knowlton) Wolfe[34]

  • Coeur d'Alene[1]
  • Grand Coulee[1]
  • Misc-Clearwater River[14]
  • Misc-St Maries[14]
  • Spokane[1]
  • White Bird[1]

A birch

Alnus hollandiana

Jennings

  • Coeur d'Alene
  • Spokane

An alder

  • Alnus prerhombifolia
  • Prunus rustii p. p.

Alnus relatus

(Knowlton) Brown

  • Coeur d'Alene
  • Grand Coulee
  • Spokane
  • White Bird

An alder

  • Phyllites relatus (1926)
  • Prunus rustii non Knowlton nec. Berry (1929)
Betula

Betula thor

Knowlton

  • Spokane

A birch

Betula vera

Brown

  • Spokane

A birch

Ostrya

Ostrya oregoniana

Chaney

A hophornbeam

Celastraceae

Euonymus

Euonymus pacificus[10]

Brown

  • Spokane

A wintercreeper species

Fabaceae

Caesalpinia

Caesalpinia spokanensis[35]

(Knowlton) Herendeen & Dilcher

  • Clarkia
  • Coeur d'Alene
  • Spokane
  • White Bird
  • Misc - Elk River

A Caesalpinia fruit
Possibly the fruits belonging to Sophora spokanensis[35]

Cercis

Unnamed

Brown

Leaves first placed as Cercis spokanensis
In need of redescription and renaming[36]

Leguminosites

Leguminosites alexanderi[9]

Berry

  • Spokane

A fabaceous fruit species

Robinia?

Robinia (?) idahoensis[15]

Ashlee

  • Misc-Grangerville Mtn

A fabaceous fruit species

Sophora

Sophora spokanensis[8]

Knowlton

A Sophora species.
Possibly the leaves belonging to Caesalpinia spokanensis[35]

  • Cassia spokanensis
  • Quercus treleasi
  • Sophora alexanderi (1926)
Fagaceae

Castanea

Castanea spokanensis

(Knowlton) Chaney & Axelrod

A Chestnut species

Castanopsis

Castanopsis perplexa

(Knowlton) Brown

  • Coeur d'Alene

A Chestnut species

Castanopsis spokanensis

(Brown) Chaney & Axelrod[1]

  • Spokane

A chinquapin species

  • Tetracera spokanensis
Fagus

Fagus pacifica

Chaney

A Beech species
Specimens in need of confirmation.[19]

Fagus washoensis

LaMotte

A Beech species

Pseudofagus

Pseudofagus idahoensis[38]

Smiley & Huggins

  • Clarkia

A fagaceous genus

Quercus

Quercus axelrodi[23]

Brown

  • Spokane

An oak.

Quercus bretzi[10]

Chaney

  • Spokane

An oak.

Quercus columbiana[32]

Chaney

  • Misc ID
    Potlach Creek
    Poorman Creek

An oak.

Quercus dayana[1]

Knowlton

  • Spokane

An oak.

Quercus eoprinus

Smith

An oak.

Quercus mccanni[21]

Berry

  • Grand Coulee

An oak.

Quercus payettensis

Knowlton

An oak.

Quercus pseudolyrata

Lesquereux

  • Grand Coulee[21]
  • Misc-Moscow[14]
  • Misc-Potlatch Creek
  • Spokane

An oak.

Quercus simulata[10]

Knowlton

An oak species

  • Laurus princeps p. p.
  • Phyllites crustacea (1926)
  • Quercus idahoensis (1898)[1]
  • Quercus chaneyi (1926)

Quercus sp.

Isolated acorn nuts
Not described to species

Quercus sp.

  • Coeur d'Alene
  • Spokane

Isolated acorn cupules
Not described to species

Juglandaceae

Carya

Carya bendirei

(Lesquereux) Chaney & Axelrod

  • Grand Coulee
  • Misc-Thorn Creek
  • White Bird

A hickory species

Palaeocarya

Palaeocarya olsonii

(Brown) Manchester

  • Misc

A Palaeocarya species

  • Engelhardia olsoni

Pterocarya

Pterocarya mixta[10]

(Knowlton) Brown

  • Spokane

A wingnut species

Malpighiaceae

Hiraea

Hiraea knowltoni[13]

(Berry) Graham

  • Spokane

A Hiraea species.

Myricaceae

Comptonia

Comptonia hesperia

Berry

  • Spokane

A sweet fern

Myrica

Myrica ashleei[32]

LaMotte

  • Misc-Elk River

A Myrica species.

Rhamnaceae

Paliurus

Paliurus hesperius[39]

Berry

  • Clarkia?
  • Misc-Clearwater River[14]
  • Grand Coulee
  • Spokane

A Paliurus species
Suggested to be possible syn of †Paliurus favonii[40]
That synonymy questioned.[41]

Rhamnus

Rhamnus columbiana[1]

Chaney & Axelrod

  • Misc - Moscow

A buckthorn species

Rosaceae

Amelanchier

Amelanchier couleeana

(Berry) Brown

A service berry species

Cercocarpus

Cercocarpus praeledifolius[9]

Berry

  • Spokane

A mountain mahogany species
Placement deemed incertae sedis (1959)[1]

Crataegus

Crataegus latahensis[15]

Ashlee

  • White Bird

A hawthorn species

Rubus

Rubus idahoensis[15]

Ashlee

  • Misc-Grangeville Mtn

A bramble species

Salicaceae Populus

Populus eotremuloides

Knowlton

  • Misc-Arrow Junct.[14]

A cottonwood species

Populus lindgreni

Knowlton

A cottonwood species

Populus voyana[1]

Chaney & Axelrod

  • Coeur d'Alene
  • Spokane - Veradale

A cottonwood species

Unnamed[9]

Berry

  • Spokane - Brickyard

Unnamed cottonwood species flower bracts

Salix

Salix hesperia

(Knowlton) Condit

A willow species

Salix kempffii[15]

Ashlee

  • Misc-Elk River

A willow species

Salix knowltoni

Berry

  • Misc-Clearwater River[14]

A willow species

Salix spokanensis

(Berry) Brown

  • Spokane

A willow species

Unnamed[9]

Berry

  • Spokane - Brickyard

Unnamed willow species stipules

Ulmaceae

Cedrelospermum

Cedrelospermum lineatum

(Lesquereux) Manchester

An ulmaceous species.

Ulmus

Ulmus newberryi

Knowlton

Elm species fruits.
Not reassessed by Tanai & Wolfe (1977)[43]

Ulmus moorei

Chaney & Elias

An Elm species

  • Fagopsis longifolia of Berry, 1934[14][1]

Ulmus speciosa

Newberry

  • Grand Coulee[43]
  • Spokane[43]
  • White Bird[43]
  • Misc-Arrow junction

An Elm species

Zelkova

Zelkova browni[43]

Tanai & Wolfe

  • Spokane

An Elm species

Superrosids - Malvids

Family Genus Species Author Florule Notes Synonyms Images

Lythraceae

Trapa

Trapa americana

Knowlton

A water caltrop species

Malvaceae

Florissantia

Florissantia speirii

(Lesquereux) MacGinitie

  • Spokane

A malvalean flower.

Tilia

Tilia aspera

(Newberry) LaMotte

A linden species

  • Platanus aspera (1883)
  • Tilia hesperia (1929)

Meliaceae

Cedrela

Cedrela pteraformis

(Berry) Brown

  • Coeur d'Alene
  • Grand Coulee
  • Misc-Juliaetta[14]
  • Spokane
  • White Bird[14]

A Cedrela.

synonymy
  • Carpolithes pteraformis
    (1929)
  • Cassia spokanensis
    (1929)
  • Gordonia pteraformis
    (1929)
  • Rhus merrilli
    of Berry, 1934[14]
  • Sapindus armstrongi
    (1929)
  • Umbellularia dayana
    of Berry (1929)

Rutaceae

Ptelea

Ptelea miocenica[21]

Berry

A Ptelea species

  • Nyssa knowltoni (1929)
Sapindaceae Acer

Acer browni

Wolfe & Tanai

  • Spokane - Veradale

An Acer species

Acer busamarum subsp. fingerrockense

Wolfe & Tanai

  • Clarkia

An Acer species

Acer chaneyi

Knowlton

  • Clarkia[45]
  • Coeur d'Alene
  • Misc-Juliaetta[14]
  • Grand Coulee
  • Spokane - Veradale

An Acer leaf morphospecies
Most likely the leaves belonging to Acer gigas

Acer gigas

Knowlton

An Acer fruit morphospecies
Most likely the fruits belonging to Acer chaneyi

Acer knolli

Wolfe & Tanai

  • Spokane

An Acer species

Acer latahense

Wolfe & Tanai

  • Spokane - Veradale

An Acer species

  • Acer glabroides p.p.

Acer medianum

Knowlton

  • Grand Coulee
  • Spokane

An Acer species

Acer niklasi

Wolfe & Tanai

  • Clarkia
  • Spokane

An Acer species

Acer smileyi

Wolfe & Tanai

  • Clarkia

An Acer species

Acer tigilense

Chelebaeva

  • Spokane

An Acer species

Acer whitebirdense

(Ashlee) Wolfe & Tanai

An Acer species

Dilodendron

Dilodendron boreale[10]

Brown

  • Spokane

A Dilodendron species

incertae sedis

Family Genus Species Author Florule Notes Synonyms Images
Incertae sedis Carpites

Carpites boraginoides

Knowlton

  • Coeur d'Alene
  • Grand Coulee
  • Spokane
  • White Bird

Seeds or nutlets of uncertain affinity
Possibly boraginaceous or malvaceous?

  • Carpolithes hibiscoides (1935)

Carpites ginkgoides

Knowlton

  • Grand Coulee
  • Spokane

A fruit/seed on a "fleshy" axis
Strongly similar to modern Ginkgo biloba fruits.

Carpites polygonoides

Knowlton

  • Spokane

Possible seeds or fruits
Reminiscent of Rumex fruits

Carpites spokanensis

Knowlton

  • Grand Coulee
  • Spokane

A seed or other reproductive organ
Brown suggested as bud scales

Ozakia

Ozakia emryi[46]

Manchester & Uemura

  • Misc - Emerald Creek

A winged fruit
An eudicot of uncertain affinity

Fungi

The Clarkia outcrops is noted for exceptionally good palynological preservation, with a number of fungal palynomorphs preserved at the sites.[7]

Order Family Genus Species Florule Notes Images

Amphisphaeriales

Cf. Apiosporaceae

indeterminate

indeterminate

Clarkia[7]

Chaetosphaeriales

Chaetosphaeriaceae

Cf. Catenularia

indeterminate

Clarkia[7]

Coronophorales

incertae sedis

Sphaerodes

indeterminate

Clarkia[7]

Dothideomycetes incertae sedis Bactrodesmium

Aff. B. abruptum

Clarkia[7]

indeterminate

Clarkia[7]

Helotiales

Helotiaceae

Bispora

indeterminate

Clarkia[7]

Hysteriales

Hysteriaceae

Cf. Acrogenospora

indeterminate

Clarkia[7]

Minutisphaerales

Minutisphaeraceae

Minutisphaera

indeterminate

Clarkia[7]

Pleosporales

Dictyosporiaceae

Dictyocheirospora

indeterminate

Clarkia[7]

Didymosphaeriaceae

Cf. Didymosphaeria

indeterminate

Clarkia[7]

Roussoellaceae

Neoroussoella

indeterminate

Clarkia[7]

Savoryellales

Savoryellaceae

Cf. Helicoon

indeterminate

Clarkia[7]

Sordariales Chaetomiaceae

Chaetomium

indeterminate

Clarkia[7]

Trichocladium

indeterminate

Clarkia[7]

Lasiosphaeriaceae

Cf. Bombardioidea

indeterminate

Clarkia[7]

Naviculisporaceae

Naviculispora

indeterminate

Clarkia[7]

Neoschizotheciaceae

Cf. Cercophora

indeterminate

Clarkia[7]

Podosporaceae

Podospora

indeterminate

Clarkia[7]

incertae sedis

Brachysporiella

indeterminate

Clarkia[7]

Cf. Sordariales

indeterminate

indeterminate

indeterminate

Clarkia[7]

Tubeufiales

Tubeufiaceae

Pendulispora

indeterminate

Clarkia[7]

Xenospadicoidales Xenospadicoidaceae Spadicoides

S. sp. 1.

Clarkia[7]

S. sp. 2.

Clarkia[7]

Xylariales Xylariaceae

Cf. Rosellinia

indeterminate

Clarkia[7]

indeterminate

indeterminate

Clarkia[7]

incertae sedis

Diporothecaceae

Diporotheca

Aff. D. rhizophila

Clarkia[7]

incertae sedis

Acarocybiopsis

indeterminate

Clarkia[7]

Cf. Brachydesmiella

indeterminate

Clarkia[7]

Desertella

indeterminate

Clarkia[7]

Endophragmia

indeterminate

Clarkia[7]

Endophragmiopsis

indeterminate

Clarkia[7]

Endophragmiella

indeterminate

Clarkia[7]

Helensiella

indeterminate

Clarkia[7]

Cf. Hermatomyces

indeterminate

Clarkia[7]

Hughesinia

indeterminate

Clarkia[7]

Cf. Lemkea

indeterminate

Clarkia[7]

Melanocephala

indeterminate

Clarkia[7]

Cf. Melanographium

indeterminate

Clarkia[7]

Phragmocephala

indeterminate

Clarkia[7]

Cf. Polytretophora

indeterminate

Clarkia[7]

Seychellomyces

indeterminate

Clarkia[7]

Insects

Order Family Genus Species Author/year Florule Notes Images
Blattodea

Hodotermitidae

Ulmeriella

Ulmeriella latahensis

Snyder, 1949

A harvester termite

Kalotermitidae

Eotermes

Indeterminate[5]

1990

  • Misc-Juliaetta

drywood termite
Not described to species

Stylotermitidae

Parastylotermes

Parastylotermes washingtonensis

(Snyder, 1931)

A Stylotermitid termite
First named as Stylotermes washingtonensis

Coleoptera

Anthribidae

Unidentified

Unidentified

"Smiley et al. 1975"

Two partial adults

Carabidae

Calosoma

Calosoma fernquisti

Cockerell, 1925

  • Spokane-Deep Creek[50]

A carabid ground beetle

Pterostichus

Pterostichus fernquisti

Wickham, 1931

A carabid ground beetle

Dascillidae

Dascillus?

Dascillus? latahensis

Lewis, 1973

A possible soft bodied plant beetle species.

Dytiscidae

Dytiscus

Dytiscus latahensis

Wickham, 1931

A predaceous diving beetle

Elateridae

Unidentified

Unidentified

"Smiley et al. 1975"

Two partial adults

Scarabaeidae

Unidentified

Unidentified

"Smiley et al. 1975"

A single whole adult.

Diptera

Anisopodidae

Sylvicola

Sylvicola carolae

(Lewis) Evenhuis, 1994

A wood gnat
First described as Anisopus carolae (1969)

Bombyliidae

Incertae sedis

"Anthrax" dentoni

Lewis, 1969

First identified as an Anthrax species bee fly
Redescribed as Bombyliidae incertae sedis (2015)[54]

Bibionidae Bibio

Bibio latahensis

Lewis, 1969

A march fly

Bibio testeus

Lewis, 1969

A march fly

Indeterminate

1969

An unidentified march fly

Bolitophilidae?

Bolitophila?

Bolitophila pulveris

Lewis, 1969

A bolitophilid gnat
Considered nomen dubium

Mycetophilidae

Boletina

Indeterminate[5]

1990

  • Misc-Juliaetta

An exechian fungus gnat

Exechia

Exechia juliaetta

Lewis, 1969

An exechian fungus gnat

Rymosia

Rymosia miocenica

Lewis, 1969

A rymosian fungus gnat

Indeterminate

Indeterminate[5]

1990

  • Misc-Juliaetta

Unidentified mycetophiline and mycetophilid fugus gnats

Sciaridae

Sciara

Sciara sepulta

Lewis, 1969

A sciarid fungus gnat

Tipulidae

Tipula

Tipula latahensis

Lewis, 1969

A Tipulid cranefly

Hemiptera

Pentatomidae

Hymenarcys

Hymenarcys cridlandi

Lewis, 1969

A pentatomid shield bug

Saldidae

Propentacora

Propentacora froeschneri[55]

(Lewis) Polhemus, 1985

  • Misc-Juliaetta

A shore bug
First described as Oreokora froeschneri (1969)

Tessaratomidae

Latahcoris

Latahcoris spectatus

Cockerell, 1931

A tessaratomid giant stink bug

Hymenoptera

Apidae

Bombus

Bombus proavus

Cockerell, 1931

  • Spokane
  • Misc-Juliaetta

A Bumblebee

Formicidae

Camponotus

Indeterminate[5]

1990

  • Misc-Juliaetta

Unidentified carpenter ants

Dolichoderus

Indeterminate[5]

1990

  • Misc-Juliaetta

Unidentified Dolichoderus species ants

Lasius

Indeterminate[5]

1990

  • Misc-Juliaetta

Unidentified Lasius species ants

Messor ?

Indeterminate[5]

1990

  • Misc-Juliaetta

Unidentified possible Messor species ants

Indeterminate

Indeterminate

1931

Unidentified ants

Ichneumonidae

Periope

Periope ivesi

Lewis, 1969

A metopiine ichneumonid wasp

Sphecophaga

Indeterminate[5]

1990

  • Misc-Juliaetta

A metopiine ichneumonid wasp

Indeterminate

Indeterminate

1990

  • Misc-Juliaetta[5]

Unidentified cryptine ichneumonid wasps

Indeterminate

Indeterminate

1990

  • Misc-Juliaetta[5]

Unidentified pimpline ichneumonid wasps

Megachilidae

Indeterminate

Indeterminate

1990

  • Misc-Juliaetta[5]

Unidentified megachiline carpenter bees

Tenthredinidae

Macrophya

Macrophya adventitia

Lewis, 1969

A tenthredinidae sawfly

Lepidoptera

Nepticulidae

Indeterminate

Indeterminate

1969

A pigmy moth larva blotch-mine trace fossil
Hosted on an oak leaf.

Odonata

Corduliidae

Miocordulia

Miocordulia latipennis

Kennedy, 1931

A corduliid dragonfly

Macromiidae

Epophthalmia

Epophthalmia biordinata

Lewis, 1969

A macromiid skimmer
Possibly a species of Macromia[59]

indeterminate

Indeterminate

Indeterminate

1990

  • Misc-Juliaetta

Unidentified dragonflies

Orthoptera

Tettigoniidae

Undescribed

Undescribed

"Smiley et al. 1975"

Partial katydid specimens

Plecoptera

Leuctridae

Megaleuctra

Megaleuctra jewetti

Lewis, 1969

A rolled-wing stonefly

Trichoptera Limnephilidae

Limnephilus

Indeterminate

1990

  • Misc-Juliaetta

An unidentified northern caddisfly

Miopsyche

Miopsyche alexanderi

Carpenter, 1931

A northern caddisfly

Miopsyche martynovi

Carpenter, 1931

A northern caddisfly

Indeterminate

1990

  • Clarkia[16]
  • Misc-Juliaetta

An unidentified northern caddisfly

Phryganeidae Folindusia

Folindusia miocenica

Berry, 1928[61]

  • Spokane

A phryganeid giant caddisfly larval case indusispecies

Folindusia sp.

1970

  • Misc-Juliaetta
  • Spokane[62]

A phryganeid giant caddisfly larval case indusispecies

Phryganea

Phryganea spokanensis

Carpenter, 1931

A giant caddisfly

Indeterminate

1990

  • Misc-Juliaetta

An unidentified giant caddisfly

Fish

Family Genus Species Author/year Florule Notes Images

Centrarchidae

Archoplites

Archoplites clarki[6]

Smith & Miller, 1985

  • Clarkia

A sun fish

Leuciscidae

Gila

Unnamed[6]

  • Clarkia

Possibly 2 species of western chub

Salmonidae

Cf. Hucho

Unnamed[6]

  • Clarkia

An unnamed salmonid
First described as a taimen, later noted to be similar to but not in Hucho[63]

Unidentified

Unidentified

Unidentified[9]

  • Spokane?
  • Misc-Weiser[14]
  • Misc-Juliaetta[14]
  • Misc-N of Lewiston[14]

Isolated scales and vertebrae
Suggested to be Leuciscus possibly the same as Leuciscus turneri[9]

Mammals

Family Genus Species Author/year Florule Notes Images

Sciuridae

incertae sedis

incertae sedis

"2018"

Clarkia

The first tetrapod from Clarkia

Algae

An initial survey of Latah Formation diatoms was conduced by Albert Mann at the behest of Frank Hall Knowlton. Based on sample material recovered from a well 0.25 mi (0.40 km) west of Mica, Washington, itself southeast of Spokane, Mann identified a large number of diatomaceous species, including 10 new species. Mann noted the diatoms appear to have lived under stressed conditions caused by caustic water, with many of the specimens showing malformed shapes or blurred ornamentations. The typical cause of this in diatoms is a high concentration of dissolved mineral salts in the water body.[4]

Family Genus Species Author/year Florule Notes Synonyms Images
Amphipleuraceae

Amphipleura

Amphipleura oregonica[4]

Grunow

  • Spokane

An amphipleuraceous diatom

  • Amphipleura pellucida var. oregonica

Frustulia

Frustulia rhomboides[4]

(Ehrenberg) De Toni

  • Spokane

An amphipleuraceous diatom

Aulacoseiraceae Aulacoseira

Aulacoseira distans[4]

(Ehrenberg) Simonsen

  • Spokane

A aulacoseiraceous diatom

  • Melosira distans

Aulacoseira granulata[4]

(Ehrenberg) Simonsen

  • Spokane

A aulacoseiraceous diatom

  • Melosira granulata

Cavinulaceae

Cavinula

Cavinula scutiformis[4]

(Grunow ex A.Schmidt) D.G.Mann & A.J.Stickle

  • Spokane

A cavinulaceous diatom

  • Navicula scutiformis

Coscinodiscaceae

Coscinodiscus

Coscinodiscus subaulacodiscoidalis[4]

Rattray

  • Spokane

A coscinodiscaceous diatom

Cymbellaceae Cymbella

Cymbella americana[4]

A.W.F.Schmidt

  • Spokane

A cymbellaceous diatom

Cymbella amphicephala[4]

Näegeli

  • Spokane

A cymbellaceous diatom

Cymbella flexella[4]

Kützing

  • Spokane

A cymbellaceous diatom

  • Achnanthes (Achnanthidium) flexella

Cymbella lunula[4]

(Ehrenberg) Rabenhorst

  • Spokane

A cymbellaceous diatom

Cymbella partita[4]

Mann

  • Spokane

A cymbellaceous diatom

Cymbella sagittarius[4]

Mann

  • Spokane

A cymbellaceous diatom

Eunotiaceae

Actinella

Actinella brasiliensis[4]

Grunow

  • Spokane

A eunotiaceous diatom

Desmogonium

Desmogonium rabenhorstianum[4]

Grunow

  • Spokane

A eunotiaceous diatom

Eunotia

Eunotia incisa[4]

Grunow

  • Spokane

A eunotiaceous diatom

Eunotia parallela[4]

Ehrenberg

  • Spokane

A eunotiaceous diatom

Eunotia pectinalis[4]

(Kuetzing) Rabenhorst

  • Spokane

A eunotiaceous diatom

Eunotia robusta[4]

Ralfs

  • Spokane

A eunotiaceous diatom
Varieties E. r. var. diadema & E. r. var. papilio

Fragilariaceae Fragilaria

Fragilaria constricta[4]

(A.Cleve) Hustedt

  • Spokane

A fragilariaceous diatom
Form Fragilaria constricta f. stricta

  • Fragilaria undata

Fragilaria binalis[4]

Ehrenberg

  • Spokane

A fragilariaceous diatom

  • Tabellaria binalis
Gomphonemataceae Gomphonema

Gomphonema acuminatum[4]

Ehrenberg

  • Spokane

A gomphonemataceous diatom

Gomphonema gracile[4]

Ehrenberg

  • Spokane

A gomphonemataceous diatom

Gomphonema parvulum[4]

(Kützing) Kützing

  • Spokane

A gomphonemataceous diatom

Melosiraceae Melosira

Melosira biseriata[4]

(Ehrenberg) Schmidt

  • Spokane

A melosiraceous diatom

Melosira lyrata[4]

Ehrenberg

  • Spokane

A melosiraceous diatom

Melosira teres[4]

Brun

  • Spokane

A melosiraceous diatom

Melosira undulata[4]

(Ehrenberg) Kützing

  • Spokane

A melosiraceous diatom

Naviculaceae

Caloneis

Caloneis westii[4]

(W.Smith) Hendey

  • Spokane

A naviculaceous diatom

  • Navicula formosa
Navicula

Navicula americana[4]

F.W. Mills

  • Spokane

A naviculaceous diatom

Navicula angusta[4]

Grunow

  • Spokane

A naviculaceous diatom

Navicula bacillum[4]

Ehrenberg

  • Spokane

A naviculaceous diatom

Navicula commutata[4]

Grunow ex A.Schmidt

  • Spokane

A naviculaceous diatom

Navicula contendens[4]

Mann

  • Spokane

A naviculaceous diatom

Navicula elegans[4]

Grunow

  • Spokane

A naviculaceous diatom

Navicula instabilis[4]

A.Schmidt

  • Spokane

A naviculaceous diatom

Navicula pauper[4]

Mann

  • Spokane

A naviculaceous diatom

Navicula placentula[4]

Pantocsek

  • Spokane

A naviculaceous diatom

Navicula pontifica[4]

Mann

  • Spokane

A naviculaceous diatom

Navicula protrudens[4]

Mann

  • Spokane

A naviculaceous diatom

Navicula pseudoaffinis[4]

Mann

  • Spokane

A naviculaceous diatom

Navicula pseudobacillum[4]

Grunow

  • Spokane

A naviculaceous diatom

Navicula pusilla[4]

Donkin

  • Spokane

A naviculaceous diatom

Navicula radiosa[4]

Kützing

  • Spokane

A naviculaceous diatom

Navicula reversa[4]

Mann

  • Spokane

A naviculaceous diatom

Navicula stauroptera[4]

Schumann

  • Spokane

A naviculaceous diatom

Navicula subacuta[4]

(Ehrenberg) Ralfs

  • Spokane

A naviculaceous diatom

Navicula substauroneis[4]

Mann

  • Spokane

A naviculaceous diatom

Navicula tabellaria[4]

(Ehrenberg) Kützing

  • Spokane

A naviculaceous diatom

Navicula transversa[4]

A.Schmidt

  • Spokane

A naviculaceous diatom

Navicula viridis[4]

(Nitzsch) Kutzing

  • Spokane

A naviculaceous diatom

Neidiaceae Neidium

Neidium dubium[4]

(Ehrenberg) Cleve

  • Spokane

A neidiaceous diatom

Neidium iridescens[4]

(Mann) VanLandingham

  • Spokane

A naviculaceous diatom

Navicula iridescens

Neidium iridis[4]

(Ehrenberg) Cleve

  • Spokane

A neidiaceous diatom

  • Navicula iridis
Pinnulariaceae Pinnularia

Pinnularia gibba[4]

Ehrenberg

  • Spokane

A pinnulariaceous diatom

  • Navicula gibba

Pinnularia gracillima[4]

W.Gregory

  • Spokane

A pinnulariaceous diatom

  • Navicula gracillima

Pinnularia major[4]

(Kützing) Rabenhorst

  • Spokane

A pinnulariaceous diatom

  • Navicula major

Pinnularia mesotyla[4]

Ehrenberg

  • Spokane

A pinnulariaceous diatom

  • Navicula mesotyla

Pinnularia nodosa[4]

(Ehrenberg) W.Smith

  • Spokane

A pinnulariaceous diatom

  • Navicula nodosa

Pinnularia rupestris[4]

Hantzsch

  • Spokane

A pinnulariaceous diatom

  • Navicula rupestris

Pinnularia subcapitata[4]

W.Gregory

  • Spokane

A pinnulariaceous diatom

  • Navicula hilseana
Stauroneidaceae Stauroneis

Stauroneis acutissima[4]

Mann

  • Spokane

A stauroneidaceous diatom

Stauroneis anceps[4]

Ehrenberg

  • Spokane

A stauroneidaceous diatom

Stauroneis phoenicenteron[4]

(Nitzsch) Ehrenberg

  • Spokane

A stauroneidaceous diatom

Surirellaceae Surirella

Surirella bifrons[4]

Ehrenberg

  • Spokane

A surirellaceous diatom

Surirella inducta[4]

A.W.F.Schmidt

  • Spokane

A surirellaceous diatom

Surirella striatula[4]

Turpin

  • Spokane

A surirellaceous diatom

Tabellariaceae Tabellaria

Tabellaria fenestrata[4]

(Lyngbye) Kützing

  • Spokane

A tabellariaceous diatom

Tabellaria flocculosa[4]

(Roth) Kützing

  • Spokane

A tabellariaceous diatom

Tetracyclus

Tetracyclus ellipticus[4]

(Ehrenberg) Grunow

  • Spokane

A tabellariaceous diatom

Tetracyclus lacustris[4]

Ralfs

  • Spokane

A tabellariaceous diatom

incertae sedis Diatoma

Diatoma grande[4]

W. Smith

  • Spokane

A diatom of uncertain familial affiliation

Diatoma tenue var. hybrida[4]

Grunow

  • Spokane

A diatom of uncertain familial affiliation

Diatoma vulgaris[4]

Bory de Saint-Vincent

  • Spokane

A diatom of uncertain familial affiliation

  • Diatoma vulgare

Gomphogramma

Gomphogramma rupestre[4]

(Kützing) Braun in Rabenhorst

  • Spokane

A bacillariophyceopus diatom of uncertain affiliation

  • Tetracyclus rupestris
Himantidium

Himantidium faba[4]

Ehrenberg

  • Spokane

A diatom of uncertain familial affiliation

  • Eunotia faba

Himantidium gracile[4]

Ehrenberg

  • Spokane

A diatom of uncertain familial affiliation

  • Eunotia gracilis

Himantidium minus[4]

Kützing

  • Spokane

A diatom of uncertain familial affiliation

  • Eunotia minus

References

  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi Chaney, R.; Axelrod, D. (1959). Miocene Floras of the Columbia Plateau: Part II. Systematic Considerations, by Ralph W. Chaney and Daniel I. Axelrod. Carnegie Institution of Washington. pp. 1–226.Miocene Floras of the Columbia Plateau at the HathiTrust Digital Library
  2. ^ a b c d Manchester, S.R.; Judd, W.S. (2024). "Remberella, a new genus of extinct ericalean flower from the Middle Miocene Latah flora of Washington and Idaho, USA". Acta Palaeobotanica. 64 (2): 413–421. doi:10.35535/acpa-2024-0016.
  3. ^ a b Calede, J.; Orcutt, J.; Kehl, W.; Richards, B. (2018). "The first tetrapod from the mid-Miocene Clarkia lagerstätte (Idaho, USA)". PeerJ. 6 (e4880): e4880. doi:10.7717/peerj.4880. PMC 5995101. PMID 29900070.
  4. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi bj bk bl bm bn bo bp bq br bs bt bu bv bw bx by bz ca Mann, A. (1926). "The fossil diatom deposit at Spokane. In: Flora of the Latah Formation of Spokane, Washington, and Coeur d'Alene, Idaho". Shorter contributions to general geology, 1925 (PDF) (Report). Professional Paper. Vol. 140. United States Geological Survey. pp. 51–55, plates XXX-XXXI. doi:10.3133/pp140A.
  5. ^ a b c d e f g h i j k l Lewis, S.; Heikes, P.; Lewis, K. (1990). "Entomofauna from Miocene deposits near Juliaetta, Idaho". Occasional Papers in Paleobiology, St Cloud State University. 4 (9): 1–22.
  6. ^ a b c d Smith, G.; Miller, R. (1985). "Taxonomy of fishes from Miocene Clarkia lake beds, Idaho.". Late Cenozoic history of the Pacific Northwest. San Francisco: American Association for the Advancement of Science. pp. 75–83.
  7. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar O’Keefe, J.M.; Pound, M.J.; Romero, I.C.; Nuñez Otaño, N.B.; Gibson, M.E.; McCoy, J.; Alden, M.E.; Fairchild, C.J.; Fitzpatrick, J.; Hodgson, E.; Horsfall, T.; Jones, S.; Lennex-Stone, J.E.; Marsh, C.A.; Patel, A.A.; Spears, T.M.; Tarlton, L.; Smallwood, L.F.; VanderEspt, O.L.; Cabrera, J.R.; Eble, C.F.; Rember, W.C.; Starnes, J.E.; Alford, M.H.; Brink, A.; Warny, S. (2024). "Summer-Wet Hydrologic Cycle during the Middle Miocene of the United States: New Evidence from Fossil Fungi". Research. 7: SI1.1. Bibcode:2024Resea...7..481O. doi:10.34133/research.0481. PMC 11420851. PMID 39319348.
  8. ^ a b c d e f g h i j k l m n o p q r Knowlton, F.H. (1926). "Flora of the Latah Formation of Spokane, Washington, and Coeur d'Alene, Idaho". Shorter contributions to general geology, 1925 (PDF) (Report). Professional Paper. Vol. 140. United States Geological Survey. pp. 17–55, plates VIII-XXXI. doi:10.3133/pp140A.
  9. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag Berry, E.W. (1929). A revision of the flora of the Latah Formation (Report). Professional Paper. United States Geological Survey. pp. 225–265. doi:10.3133/pp154h. 154-H.
  10. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z Brown, R. W. (1937). Additions to some fossil floras of the Western United States (PDF) (Report). Professional Paper. Vol. 186. United States Geological Survey. pp. 163–206. doi:10.3133/pp186J.
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