The Lulworth Formation is a geologic formation in England. It dates from the late Tithonian to the mid Berriasian. It is a subunit of the Purbeck Group.[1] In Dorset, it consists of three members, which are in ascending order, the Mupe Member, the Ridgway Member, and the Warbarrow Tout Member. The Mupe Member is typically 11 to 16 m thick and largely consists of marls and micrites with interbeds of calcareous mudstone.[2] The Ridgeway Member is about 3 to 7 m thick and consists of in its western portion carbonaceous muds, marls and micrites, in the east the muds are replaced by micritic limestone.[3] The Warbarrow Tout Member is 17 to 39 m thick and consists of limestone at the base and micrite and mudstone for the rest of the sequence,[4] this member is the primary source of the vertebrate fossils within the formation.[5][6] Elsewhere the unit is undifferentiated.
Vertebrate paleobiota
Amphibians
Turtles
Lepidosaurs
Dinosaurs
| Dinosaurs reported from the Lulworth Formation
|
| Genus
|
Species
|
Location
|
Stratigraphic position
|
Material
|
Notes
|
Images
|
| Echinodon
|
E. becklesii[10]
|
Durlston Bay, Swanage[10]
|
|
Teeth and dentary
|
A small heterodontosaurid
|
|
| Owenodon
|
O. hoggii[11]
|
Durlston Bay, Swanage
|
|
Partial dentary
|
An iguanodontoid
|
|
| Nuthetes
|
N. destructor[12]
|
Feather Quarry, Durlston Bay, Swanage
|
|
Teeth, dentary fragment
|
Small dromaeosaur
|
|
Mammals
| Mammals reported from the Lulworth Formation
|
| Genus
|
Species
|
Location
|
Stratigraphic position
|
Material
|
Notes
|
Images
|
| Albionbaatar
|
A. denisae
|
Sunnydown Farm Quarry
|
|
|
Albionbaataridae
|
|
| Amblotherium
|
A. pusillum, A. soricinum, A. nanum
|
Mammal Bed
|
|
|
|
|
| Bolodon
|
B. minor, B. crassidens, B. osborni, B. elongatus, B. falconeri
|
Mammal Bed
|
|
|
Plagiaulacidae
|
|
| Chunnelodon
|
C. alopekodes
|
Sunnydown Farm Quarry
|
|
|
|
|
| Ctenacodon
|
C. minor
|
Mammal Bed
|
|
|
Allodontidae
|
|
| Dorsetodon
|
D. haysomi
|
Sunnydown Farm Quarry
|
|
|
Paurodontidae
|
|
| Durlstotherium
|
D. newmani
|
Mammal Bed
|
|
|
|
|
| Durlstodon
|
D. ensomi
|
Mammal Bed
|
|
|
|
|
| Gerhardodon
|
G. purbeckensis
|
Sunnydown Farm Quarry
|
|
|
Pinheirodontidae
|
|
| Kouriogenys
|
K. minor
|
Mammal Bed
|
|
|
Peramuridae
|
|
| Magnimus
|
M. ensomi
|
Sunnydown Farm Quarry
|
|
|
|
|
| Peraiocynodon
|
P. inexpectatus
|
Mammal Bed
|
|
|
Docodontidae
|
|
| Peramuroides
|
P. tenuiscus
|
Mammal Bed
|
|
|
Peramuridae
|
|
| Peramus
|
P. tenuirostris, P. dubius, P. minor
|
Mammal Bed
|
|
|
Peramuridae
|
|
| Peraspalax
|
P. talpoides
|
Mammal Bed, Sunnydown Farm Quarry
|
|
|
Dryolestidae
|
|
| Phascolestes
|
P. mustelula
|
Mammal Bed, Sunnydown Farm Quarry
|
|
|
Dryolestidae
|
|
| Plagiaulax
|
P. becklesii
|
Mammal Bed
|
|
|
Plagiaulacidae
|
|
| Purbeckodon
|
P. batei
|
Sunnydown Farm Quarry
|
|
|
Morganucodonta
|
|
| Spalacotherium
|
S. tricuspidens, S. evansae, S. hookeri
|
Mammal Bed, Sunnydown Farm Quarry
|
|
|
Spalacotheriidae
|
|
| Sunnyodon
|
S. notleyi
|
Sunnydown Farm Quarry
|
|
|
Paulchoffatiidae
|
|
| Thereuodon
|
T. taraktes
|
Sunnydown Farm Quarry
|
|
|
|
|
| Tinodon
|
T. micron
|
Sunnydown Farm Quarry
|
|
|
Tinodontidae
|
|
| Triconodon
|
T. mordax
|
Mammal Bed, Sunnydown Farm Quarry
|
|
|
|
|
| Trioracodon
|
T. bisulcus, T. major, T. oweni
|
Mammal Bed, Feather Quarry
|
|
|
|
|
See also
References
- ^ "Lulworth Formation". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Mupe Member". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Ridgeway Member". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Warbarrow Tout Member". BGS Lexicon of Named Rock Units. British Geological Survey. Retrieved 28 August 2018.
- ^ "Sunnydown Farm Quarry (clay: upper horizon; equivalent to DB 102/103 )". Paleobiology Database. Retrieved 28 August 2018.
- ^ "Mammal Bed, Durlston Bay (DB83)". Paleobiology Database. Retrieved 28 August 2018.
- ^ Evans, Susan E.; McGowan, Gerard J. (2002). "Lissamphibian remains from the Purbeck Limestone Group, southern England". Special Papers in Palaeontology: 104–119.
- ^ Milner, Andrew R. (November 2004). "The turtles of the Purbeck Limestone Group of Dorset, southern England" (PDF). Palaeontology. 47 (6): 1441–1467. Bibcode:2004Palgy..47.1441M. doi:10.1111/j.0031-0239.2004.00418.x. ISSN 0031-0239.
- ^ Pérez-García, A. (May 2014). "Revision of the poorly known Dorsetochelys typocardium, a relatively abundant pleurosternid turtle (Paracryptodira) in the Early Cretaceous of Europe". Cretaceous Research. 49: 152–162. Bibcode:2014CrRes..49..152P. doi:10.1016/j.cretres.2014.02.015. ISSN 0195-6671.
- ^ a b "Type specimen: BMNH 48209, 48210, a mandible. Its type locality is cliff face, Durlston Bay, which is in a Berriasian fluvial-lacustrine limestone in the Lulworth Formation of the United Kingdom". fossilworks.org.
- ^ "Type specimen: BMNH R2998. Its type locality is Durlston Bay, Swanage (DB105-107), which is in a Berriasian marine limestone in the Lulworth Formation of the United Kingdom".
- ^ "Type specimen: DORCM G913, a mandible. Its type locality is Feather Quarry, Durlston Bay (DB102), which is in a Berriasian marine shale in the Lulworth Formation of the United Kingdom".