Also known as Loc. 25

Where: Baja California Sur, Mexico (26.6° N, 112.1° W: paleocoordinates 25.8° N, 105.7° 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. Believed by J. Gardner to be Late Miocene, although J. Smith made strong correlations with the lower Miocene of California.

• bed-level stratigraphic resolution

Environment/lithology: coastal; white sandstone

Size class: macrofossils

Collection methods: quarrying,

• Collection studied and determined by J. Gardner (Stanford), reidentified by J. Smith. 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 43812: authorized by Austin Hendy, entered by Austin Hendy on 26.08.2004

Creative Commons license: CC BY (attribution)