Locality 31, Bahia Tortuga - Beal (1948) (Miocene of Mexico)

Also known as Loc. 31

Where: Baja California Sur, Mexico (27.7° N, 114.9° W: paleocoordinates 26.8° N, 108.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Ysidro Formation, Early/Lower Miocene (23.0 - 16.0 Ma)

• The Ysidro Formation consists of dirty-white sandstone, underlying the Comondu Formation. The formation varies in lithology from place to place and apparently becomes more tuffaceous towards the gulf coast. The formation can be subdivided into two members, a lower shale member and an upper sandstone member. Collected from just above contact with Tepetate

• bed-level stratigraphic resolution

Environment/lithology: marine; white sandstone

• No paleoenvironmental data presented.
• Dirty white sandstone.

Size class: macrofossils

Collection methods: quarrying,

• Collected, studied and determined by Hertlein and Jordan (1927). 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: biostratigraphic analysis

PaleoDB collection 43806: authorized by Austin Hendy, entered by Austin Hendy on 26.08.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

• Representative.
Bivalvia
 Pectinida - Pectinoidae
"Pecten (Leptopecten) andersoni" = Aequipecten andersoni
"Pecten (Leptopecten) andersoni" = Aequipecten andersoni Arnold 1906 scallop
Chondrichthyes
 Odontaspidida - Carcharodontidae
"Isurus hastalis" = Cosmopolitodus hastalis
"Isurus hastalis" = Cosmopolitodus hastalis Agassiz 1843 elasmobranch
 Carchariniformes - Hemigaleidae
Hemipristis heteropleurus Agassiz 1844 ground shark