Locality 17, Arroyo Hondo - Beal (1948) (Eocene of Mexico)

Also known as Loc. 17

Where: Baja California Sur, Mexico (24.2° N, 110.11° W: paleocoordinates 24.3° N, 98.1° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Tepetate Formation, Middle Eocene (48.6 - 37.2 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 Eocene age

• 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 43753: authorized by Austin Hendy, entered by Austin Hendy on 25.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative.
unclassified
  -
Agazzizia sp.
cf. species from St Bartholomew
Bivalvia
 Mytilida - Mytilidae
Mytilus sp. Linnaeus 1758 mussel
 Ostreida - Gryphaeidae
"Crenostrea sp." = Pycnodonte (Crenostrea)
"Crenostrea sp." = Pycnodonte (Crenostrea) Marwick 1931 oyster
 Pectinida - Pectinoidae
Spondylus sp. Linnaeus 1758 scallop
 Carditida - Carditidae
"Venericardia cf. rotunda" = Venericardia (Rotundicardia) rotunda Lea 1833 clam
  - Aviculidae
Avicula sp. Bruguière 1791 clam
Gastropoda
 Architaenioglossa - Ampullinidae
"Amauropsis cf. oviformis" = Ampullina oviformis
"Amauropsis cf. oviformis" = Ampullina oviformis Gabb 1864 snail
 Neogastropoda - Muricidae
Trophon sp. Montfort 1810 murex snail
 Neogastropoda - Volutidae
Volutilithes sp. Swainson 1829 volute
 Neogastropoda - Olividae
Oliva sp. Bruguière 1789 olive snail
 Sorbeoconcha - Ranellidae
"? Tritonium sp." = Charonia
"? Tritonium sp." = Charonia Gistel 1848 triton
 Sorbeoconcha - Naticidae
Natica cf. dumblei, "Amauropsis cf. perovata" = Crommium perovatum
"Amauropsis cf. perovata" = Crommium perovatum Conrad 1846 moon snail
 Neritoidea - Neritidae
"Neritina grandis" = Velates vokesi
"Neritina grandis" = Velates vokesi Cooke 1946 snail
Echinoidea
 Spatangoida - Schizasteridae
Schizaster sp. Agassiz 1835 heart urchin
Schizaster subcylindricus Cotteau 1875 heart urchin
St. Bartholomew sp.
Orthophragmina
  -
Orthophragmina sp. Munier-Chalmas 1891
Euspatangus
  -
Euspatangus antillarium
St. Bartholomew sp.