Locality 16, Arroyo Colorado - Beal (1948) (Eocene of Mexico)

Also known as Loc. 16

Where: Baja California Sur, Mexico (31.3° N, 116.3° W: paleocoordinates 31.5° N, 103.2° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Tepetate Formation, Middle Eocene (47.8 - 37.7 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. Considered based on fauna to be Middle of Upper Eocene age, restricted to middle Eocene by enterer.

• group of beds-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,

• Collected by Smith. Collection studied and determined by J. Gardner, and C.W. Cooke (USGS). 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 43754: authorized by Austin Hendy, entered by Austin Hendy on 25.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative.
Echinoidea
 Spatangoida - Schizasteridae
Schizaster sp. Agassiz 1835 heart urchin
Polychaeta
 Sabellida - Serpulidae
Gastropoda
 Neritoidea - Neritidae
""Neritina" grandis" = Velates vokesi
""Neritina" grandis" = Velates vokesi Cooke 1946 snail
Bivalvia
 Ostreida - Gryphaeidae
"Crenostrea sp." = Pycnodonte (Crenostrea)
"Crenostrea sp." = Pycnodonte (Crenostrea) Marwick 1931 oyster