Also known as Loc. 27

Where: Baja California Sur, Mexico (26.2° N, 112.3° W: paleocoordinates 25.3° N, 105.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Upper Member (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.

• bed-level stratigraphic resolution

Environment/lithology: coastal; fine-grained, white sandstone

Size class: macrofossils

Collection methods: quarrying,

• Collected by E.C. Brown. Collection studied and determined by Hertlein and Jordon. 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 43810: authorized by Austin Hendy, entered by Austin Hendy on 26.08.2004

Creative Commons license: CC BY (attribution)