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San Sebastián Limestone

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Geologic formation in Puerto Rico
San Sebastián Formation
Stratigraphic range: Early to Late Oligocene, 29.8–26.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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
Region Puerto Rico
Country United 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.

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. 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.

Vertebrate paleofauna

Based on the Paleobiology Database:

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.

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.
Caribeomys C. merzeraudi Teeth A geomyoid rodent. Type locality of genus and species, first evidence of geomyoids from the Caribbean.
Caribosiren C. turneri A dugongid sirenian.
Priscosiren P. atlantica A dugongid sirenian.

See also

References

  1. ^ "PBDB Strata Results". Paleobiology Database. Retrieved 2024-11-16.
  2. ^ 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. ^ 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. ^ 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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