San Sebastián Limestone

San Sebastián Formation
Stratigraphic range: Early to Late Oligocene,
TypeFormation
Unit ofRio Guatemala Group
Lithology
PrimaryLimestone
OtherSandstone, mudstone
Location
Coordinates18°24′N 67°00′W / 18.4°N 67.0°W / 18.4; -67.0
Approximate paleocoordinates17°36′N 66°00′W / 17.6°N 66.0°W / 17.6; -66.0
RegionPuerto Rico
CountryUnited States
Type section
Named forSan Sebastián, Puerto Rico

The San Sebastián Formation is a geologic formation in Puerto Rico. It preserves fossils dating back to the Oligocene period.[1]

It was primarily deposited as limestone in a marine environment, but some localities with a significant amount of terrestrial fauna appear to have been deposited in a deltaic environment. It contains some of the earliest fossils of terrestrial Caribbean vertebrates, including chinchilloid rodents and Eleutherodactylus frogs.[2][3] In addition, taxa that are no longer known from the Caribbean, such as gavialid crocodilians and geomyoid rodents, have also been recovered from the formation.[4]

Vertebrate paleofauna

Based on the Paleobiology Database:[1]

Cartilaginous fish

Genus Species Location Notes Images
Ginglymostomatidae indet. A nurse shark of uncertain affinities.

Amphibians

Genus Species Material Notes Images
Eleutherodactylus E. sp. Distal humerus A coquí frog.[3]

Reptiles

Genus Species Material Notes Images
Aktiogavialis A. puertoricensis Incomplete braincase, cranial elements A gavialid crocodilian. Type locality of genus and species.
Pelomedusidae indet. A pelomedusid side-necked turtle.

Mammals

Genus Species Material Notes Images
Borikenomys B. praecursor Teeth A chinchilloid rodent. Type locality of genus and species.[2]
Caribeomys C. merzeraudi Teeth A geomyoid rodent. Type locality of genus and species, first evidence of geomyoids from the Caribbean.[4]
Caribosiren C. turneri A dugongid sirenian.
Priscosiren P. atlantica A dugongid sirenian.

See also

References

  1. ^ a b "PBDB Strata Results". Paleobiology Database. Retrieved 2024-11-16.
  2. ^ a b Marivaux, Laurent; Vélez-Juarbe, Jorge; Merzeraud, Gilles; Pujos, François; Viñola López, Lázaro W.; Boivin, Myriam; Santos-Mercado, Hernán; Cruz, Eduardo J.; Grajales, Alexandra; Padilla, James; Vélez-Rosado, Kevin I.; Philippon, Mélody; Léticée, Jean-Len; Münch, Philippe; Antoine, Pierre-Olivier (2020-02-12). "Early Oligocene chinchilloid caviomorphs from Puerto Rico and the initial rodent colonization of the West Indies". Proceedings of the Royal Society B: Biological Sciences. 287 (1920): 20192806. doi:10.1098/rspb.2019.2806. ISSN 0962-8452. PMC 7031660. PMID 32075529.
  3. ^ a b Blackburn, David C.; Keeffe, Rachel M.; Vallejo-Pareja, María C.; Vélez-Juarbe, Jorge (2020). "The earliest record of Caribbean frogs: a fossil coquí from Puerto Rico". Biology Letters. 16 (4): 20190947. doi:10.1098/rsbl.2019.0947. ISSN 1744-9561. PMC 7211465. PMID 32264782.
  4. ^ a b Marivaux, Laurent; Vélez-Juarbe, Jorge; Viñola López, Lázaro W.; Fabre, Pierre-Henri; Pujos, François; Santos-Mercado, Hernán; Cruz, Eduardo J.; Grajales Pérez, Alexandra M.; Padilla, James; Vélez-Rosado, Kevin I.; Cornée, Jean-Jacques; Philippon, Mélody; Münch, Philippe; Antoine, Pierre-Olivier (2021). Lautenschlager, Stephan (ed.). "An unpredicted ancient colonization of the West Indies by North American rodents: dental evidence of a geomorph from the early Oligocene of Puerto Rico". Papers in Palaeontology. 7 (4): 2021–2039. doi:10.1002/spp2.1388. hdl:2027.42/170885. ISSN 2056-2799.


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