Locality 11, Arroyo san Antonio - Beal (1948) (Paleocene of Mexico)

Also known as Loc. 11

Where: Baja California Sur, Mexico (30.3° N, 115.8° W: paleocoordinates 34.5° N, 95.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tepetate Formation, Paleocene (66.0 - 56.0 Ma)

• Paleocene and Eocene series are named the Tepetate Formation in Baja California. The strata probably underlie a large part of the region covered by latter rocks, the uppermost beds lapping over the edges of the older formations and lying on the granite of the main range. Unclear whether these are Paleocene or early Eocene. Paleocene assigned by enterer because of presence of C. mathewsoni.

• bed-level stratigraphic resolution

Environment/lithology: deltaic; fine-grained, yellow siltstone and sandstone

• The formation shows strong evidence of being a delta and near-shore deposit.
• In many places it is composed largely of fine yellow silt and contains sandstone beds with mammoth cross-bedding.

Size class: macrofossils

Collection methods: quarrying,

• Collection studied and determined by J. Gardner. No known repository.

Primary reference: C. H. Beal. 1948. Reconnaissance of the geology and oil possibilities of Baja California, Mexico. Geological Society of America Memoir 31 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 43761: authorized by Austin Hendy, entered by Austin Hendy on 25.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative.
Bivalvia
 Arcida - Cucullaeidae
 Cardiida - Tellinidae
? Tellina sp. Linnaeus 1758 tellin clam
 Cardiida - Semelidae
Semele sp. Schumacher 1817 clam
 Cardiida - Cardiidae
Cardium sp. Linnaeus 1758 cockle
"Cardium cf. brewerii" = Acanthocardia (Schedocardia) brewerii Gabb 1864 cockle
 Protobranchia - Nuculanidae
"Leda sp." = Nuculana
"Leda sp." = Nuculana Link 1807 pointed nut clam
Gastropoda
 Cephalaspidea - Cylichnidae
Cylichna sp. Lovén 1846 snail
 Naticoidea - Naticidae
Amauropsis sp. Mörch 1857 moon snail
 Sorbeoconcha - Turritellidae
Turritella cf. uvasana Conrad 1865 turret shell
Listed as "Turritella n. sp. cf. uvasana"