La Gachupina (Jurassic of Mexico)

Where: Chiapas, Mexico (16.7° N, 93.5° W: paleocoordinates 10.2° N, 45.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: San Ricardo Formation, Kimmeridgian (157.3 - 152.1 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: shallow subtidal; lithified limestone and lithified marl

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: G. Alencaster. 1977. Moluscos y braquiopodos del Jurasico superior de Chiapas [Upper Jurassic molluscs and brachiopods from Chiapas]. Revista mexicana de ciencias geologicas 1(2):151-166 [W. Kiessling/U. Merkel/M. Manojlovic]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 98672: authorized by Wolfgang Kiessling, entered by Uta Merkel on 18.10.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Rhynchonellata
 Terebratulida - Postepithyrididae
"Sellithyris subsella" = Xestosina subsella
"Sellithyris subsella" = Xestosina subsella Leymerie 1846
Bivalvia
 Pectinida - Anomiidae
Placunopsis sp. Morris and Lycett 1853 scallop
 Mytilida - Mytilidae
Inoperna cf. perplicata Etallon 1863 mussel
 Carditida - Crassatellidae
Ptychomya stantoni Cragin 1905 clam
 Pholadida - Ceratomyidae
? Ceratomya sp. Sandberger 1864 clam
? Gresslya sp. Agassiz 1843 clam
 Pholadida - Pleuromyidae
Pleuromya tellina Agassiz 1842 clam
 Cardiida - Corbiculidae
Eocallista pulchella Loriol and Pellat 1868 clam
 Cardiida - Tancrediidae
 Cardiida - Cardiidae
Protocardia cf. pesolina Contejean 1859 cockle
Protocardia dufrenoyca Buvignier 1852 cockle
 Lucinida - Lucinidae
Lucina cf. radiata Contejean 1859 clam
Mesomiltha portlandica Sowerby 1836 clam
 Protobranchia - Nuculanidae
Nuculana sp. Link 1807 pointed nut clam
Gastropoda
 Stromboidea - Aporrhaidae
Harpagodes oceani Brongniart 1821 snail
 Littorinoidea - Purpurinidae
? Purpuroidea acatlana Alencaster and Buitron 1965 periwinkle
 Naticoidea - Naticidae
? Natica cf. hemispherica Romer 1836 moon snail
 Heterobranchia - Nerineidae
Nerinea gachupinae n. sp. Alencaster 1977 snail