Where: Baja California, Mexico (31.5° N, 116.7° W: paleocoordinates 29.9° N, 68.2° W)
• small collection-level geographic resolution
When: upper Member (Alisitos Formation), Late/Upper Aptian (122.5 - 112.0 Ma)
• Age: "Aptian to middle Albian." Squires and Saul (2004) confirming and following Allison (1974) place this collection in the Late Aptian.
• bed-level stratigraphic resolution
Environment/lithology: shallow subtidal; conglomerate
Collection methods: mechanical,
Primary reference: E. C. Allison. 1955. Middle Cretaceous gastropoda from Punta China, Baja California, Mexico. Journal of Paleontology 29(3):400-432 [J. Alroy/M. Sommers/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 1878: authorized by John Alroy, entered by Mike Sommers on 10.06.1999, edited by Jonathan Marcot, Austin Hendy and Wolfgang Kiessling
Creative Commons license: CC BY (attribution)
Taxonomic list
Foraminifera | |
Nodosariata | |
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Demospongiae | |
Cliona sp. demosponge | |
Anthozoa | |
""Montastrea" sp." = Montastraea1
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Isastrea whitneyi Wells 1932 stony coral | |
Astrocoenia sp. Milne-Edwards and Haime 1848 stony coral | |
Malacostraca | |
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Bivalvia | |
Gryphaea wardi oyster | |
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"Linearia sp." = Linearis
"Linearia sp." = Linearis Conrad 1860 tellin clam | |
Caprinuloidea sp. Palmer 1928 rudist | |
Corbula sp. Bruguière 1789 clam | |
Gastropoda | |
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Liocarenus (Liocarenus) formosum Cragin 1893 snail | |
Aptyxiella (Aptyxiella) cf. subula Roemer 1888 snail (Aptyxiella) - originally entered as "Aptyxiella cf. subula"
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Nerinea (Plesioptygmatis) bosei, Nerinea (Plesioptygmatis) tomasensis, Nerinea (Plesioptygmatis) cf. pseudoconvexa
Nerinea (Plesioptygmatis) bosei Allison 1955 snail
Nerinea (Plesioptygmatis) tomasensis Allison 1955 snail
Nerinea (Plesioptygmatis) cf. pseudoconvexa Stanton 1947 snail (Plesioptygmatis) - originally entered as "Nerinea cf. pseudoconvexa"
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"? Pyrazus harrissi n. sp." = Alamirifica harrissi
"? Pyrazus harrissi n. sp." = Alamirifica harrissi Allison 1955 snail originally entered as "? Pyzarus harrissi"
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Cimolithium eleanorae Allison 1955 snail
Uchauxia kirki Allison 1955 snail
Uchauxia beali Allison 1955 snail | |
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Natica importuna Nagao 1934 moon snail | |
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Pyrazus (Echinobathra) durhami n. sp. Allison 1955 horn snail
Pyrazus (Echinobathra) austinense Roemer 1888 horn snail | |
Tectus (Tectus) tomasensis n. sp.
Tectus (Tectus) tomasensis n. sp. Allison 1955 top snail | |
Cirsochilus gilberti n. sp.
Cirsochilus gilberti n. sp. Allison 1955 snail | |
Agnathodonta brooksi n. sp.
Agnathodonta brooksi n. sp. Allison 1955 snail n. sp. - originally entered as "Agnathodonta brooksi"
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Otostoma (Lyosoma) japonica Nagao 1934 snail
Semineritina apparata Cragin 1893 snail | |
Neritoma (Neridomus) delpeyae n. sp. Allison 1955 snail | |
Echinoidea | |
Pygopyrina sp. Pomel 1883 sea urchin |