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
Gastropoda
 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"
 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.
 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
 Neogastropoda - Fasciolariidae
Euthriofusus wenzi n. sp.
Euthriofusus wenzi n. sp. Allison 1955 snail
 Sorbeoconcha - Aporrhaidae
Anchura (Anchura) andersoni n. sp.
Anchura (Anchura) andersoni n. sp. Allison 1955 snail
 Sorbeoconcha - Triforidae
Cerithiella (Cerithiella) ? kickapooense
Cerithiella (Cerithiella) ? kickapooense Stanton 1947 snail
(Cerithiella) - originally entered as "Cerithiella ? kickapooense"
 Sorbeoconcha - Tylostomatidae
Tylostoma allisoni
Tylostoma allisoni Squires and Saul 2004 snail
 Sorbeoconcha - Cassiopidae
Cassiope (Gymnetome) gwynae n. sp., Cassiope (Cassiope) kleinpelli n. sp.
Cassiope (Gymnetome) gwynae n. sp. Allison 1955 snail
Cassiope (Cassiope) kleinpelli n. sp. Allison 1955 snail
 Cerithioidea - Potamididae
Pyrazus (Echinobathra) durhami
Pyrazus (Echinobathra) durhami Allison 1955 horn snail
 Cerithioidea - Metacerithiidae
Metacerithium sp.
Metacerithium sp. Cossmann 1906 snail
 Cerithioidea - Turritellidae
? Turritella durhami n. sp., "Turritella (Haustator) aff. seriatimgranulata" = Turritella seriatimgranulata, Mesalia (Mesalia) mauryae n. sp.
? Turritella durhami n. sp. Allison 1955 turret shell
"Turritella (Haustator) aff. seriatimgranulata" = Turritella seriatimgranulata Roemer 1849 turret shell
(Haustator) - originally entered as "Turritella aff. seriatimgranulata"
Mesalia (Mesalia) mauryae n. sp. Allison 1955 turret shell
 Epitonioidea - Epitoniidae
"Amaea (Confusiscala) sp." = Confusiscala, Opalia (Crassiscala) riachuelanum
"Amaea (Confusiscala) sp." = Confusiscala de Boury 1909 wentletrap
Opalia (Crassiscala) riachuelanum Maury 1936 wentletrap
Bivalvia
 Trigoniida - Trigoniidae
Trigonia stolleyi
Trigonia stolleyi Hill 1893 clam
 Cardiida - Veneridae
Resatrix sp.
Resatrix sp. Casey 1952 venus clam
 Cardiida - Cardiidae
Protocardia stonei, ? Integricardium sp.
Protocardia stonei Cragin 1893 cockle
? Integricardium sp. Rollier 1912 cockle
originally entered as "? Intergricardium sp."
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium sp.
Dentalium sp. Linnaeus 1758 tusk shell
Anthozoa
 Scleractinia - Montlivaltiidae
Placosmilia sp., Montlivaltia sp.
Placosmilia sp. Milne-Edwards and Haime 1848 stony coral
Montlivaltia sp. Lamouroux 1821 stony coral