PBDB Collection

Alisitos Fm. (UCB A-8331) (Cretaceous of Mexico)

Where: Baja California, Mexico (31.5° N, 116.7° W: paleocoordinates 29.9° N, 68.2° W)

• small collection-level geographic resolution

When: lower Member (Alisitos Formation), Late/Upper Aptian (122.5 - 113.0 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; lithified, volcaniclastic, brown, gray, green siltstone

• "Moderately well consolidated, massive, gray-green to brown tuffaceous siltstone...~10-15 m above lowest mid cret. exposures along south side of Punta China."

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 1890: authorized by John Alroy, entered by Mike Sommers on 10.06.1999, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

• Abundances: A = 20+, C = 6-20, F = 3-5, R = 1-2. "A spectacular feature of the middle Albian deposits at Punta China is the fine preservation exhibited by many of the fossils. Despite the coarseness of some of the volcanic breccias, fragile tests of Forams, echinoids, and small molluscs are almost perfectly preserved. Pelecypods almost always occur with both valves intact. Some gastropods retain original pigmentation."

Show authors, comments, and common names

Bivalvia
Trigoniida - Trigoniidae	Trigonia stolleyi Trigonia stolleyi Hill 1893 clam
Cardiida - Cardiidae	Protocardia stonei, ? Integricardium sp. Protocardia stonei Cragin 1893 cockle ? Integricardium sp. Rollier 1912 cockle originally entered as "? Intergricardium sp."
Cardiida - Veneridae	Resatrix sp. Resatrix sp. Casey 1952 venus clam
Scaphopoda
Dentaliida - Dentaliidae	Dentalium sp. Dentalium sp. Linnaeus 1758 tusk shell
Gastropoda
Epitonioidea - Epitoniidae	"Amaea (Confusiscala) sp." = Confusiscala, Opalia (Crassiscala) riachuelanum "Amaea (Confusiscala) sp." = Confusiscala de Boury 1909 wentletrap Opalia (Crassiscala) riachuelanum Maury 1936 wentletrap
Cerithioidea - Potamididae	Pyrazus (Echinobathra) durhami Pyrazus (Echinobathra) durhami Allison 1955 horn snail
Cerithioidea - Metacerithiidae	Metacerithium sp. Metacerithium sp. Cossmann 1906 snail
Cerithioidea - Turritellidae	"Turritella (Haustator) aff. seriatimgranulata" = Turritella seriatimgranulata, ? Turritella durhami n. sp., Mesalia (Mesalia) mauryae n. sp. "Turritella (Haustator) aff. seriatimgranulata" = Turritella seriatimgranulata Roemer 1849 turret shell (Haustator) - originally entered as "Turritella aff. seriatimgranulata" ? Turritella durhami n. sp. Allison 1955 turret shell Mesalia (Mesalia) mauryae n. sp. Allison 1955 turret shell
Sorbeoconcha - Tylostomatidae	Tylostoma allisoni Tylostoma allisoni Squires and Saul 2004 snail
Sorbeoconcha - Cassiopidae	Cassiope (Cassiope) kleinpelli n. sp., Cassiope (Gymnetome) gwynae n. sp. Cassiope (Cassiope) kleinpelli n. sp. Allison 1955 snail Cassiope (Gymnetome) gwynae n. sp. Allison 1955 snail
Sorbeoconcha - Aporrhaidae	Anchura (Anchura) andersoni n. sp. Anchura (Anchura) andersoni n. sp. Allison 1955 snail
Neogastropoda - Fasciolariidae	Euthriofusus wenzi n. sp. Euthriofusus wenzi n. sp. Allison 1955 snail
Sorbeoconcha - Triforidae	Cerithiella (Cerithiella) ? kickapooense Cerithiella (Cerithiella) ? kickapooense Stanton 1947 snail (Cerithiella) - originally entered as "Cerithiella ? kickapooense"
Sorbeoconcha - Purpurinidae	Microschiza (Cloughtonia) scalaris Microschiza (Cloughtonia) scalaris Conrad in Lynch 1852 periwinkle
Sorbeoconcha - Naticidae	"Natica japonica" = Natica (Amauropsis) japonica "Natica japonica" = Natica (Amauropsis) japonica Nagao 1934 moon snail
Heterostropha - Nerinellidae	"Aptyxiella (Endiatrachelus) parallela" = Nerinella parallela "Aptyxiella (Endiatrachelus) parallela" = Nerinella parallela Anderson and Hanna 1935 snail
Heterostropha - Acteonellidae	Actaeonella fusiformis Actaeonella fusiformis Coquand 1865 snail
Heterostropha - Ringiculidae	? Oligoptycha popenoei n. sp. ? Oligoptycha popenoei n. sp. Allison 1955 snail
Heterostropha - Tubiferidae	Pseudonerinea stantoni n. sp., Pseudonerinea stirtoni Pseudonerinea stantoni n. sp. Allison 1955 snail Pseudonerinea stirtoni Allison 1955 snail n. sp.
Trochoidea - Liotiidae	Encycloscala emersoni n. sp. Encycloscala emersoni n. sp. Allison 1955 snail originally entered as "Encycloscala emersoni"
Trochoidea - Trochidae	"Calliostoma (Calliostoma) aff. cragini" = Calliostoma cragini "Calliostoma (Calliostoma) aff. cragini" = Calliostoma cragini Stanton 1947 top snail (Calliostoma) - originally entered as "Calliostoma aff. cragini"
Anthozoa
Scleractinia - Montlivaltiidae	Placosmilia sp. Placosmilia sp. Milne-Edwards and Haime 1848 stony coral
Scleractinia - Thecosmiliidae	Montlivaltia sp. Montlivaltia sp. Lamouroux 1821 stony coral