Also known as Loc. 22
Where: Baja California Sur, Mexico (27.2° N, 113.3° W: paleocoordinates 26.4° N, 107.9° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Lower Member (Ysidro Formation), Early/Lower Miocene to Early/Lower Miocene (23.0 - 11.6 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; lithified, white sandstone
Size class: macrofossils
Preservation: mold/impression
Collection methods: quarrying,
• Collection studied and determined by J. Smith (Stanford). 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 43804: authorized by Austin Hendy, entered by Austin Hendy on 26.08.2004, edited by Mark Uhen
Creative Commons license: CC BY (attribution)
Taxonomic list
Gastropoda | |
Turritella aff. inezana Conrad 1857 turret shell | |
Bivalvia | |
"Arca aff. devincta" = Anadara (Anadara) devincta
"Arca aff. devincta" = Anadara (Anadara) devincta Conrad 1849 ark | |
Glycymeris sp. Da Costa 1778 clam | |
"Pecten aff. keepi" = Euvola keepi
"Pecten aff. keepi" = Euvola keepi Arnold 1906 scallop | |
Mytilus sp. Linnaeus 1758 mussel | |
? Phacoides sp. Blainville 1825 clam | |
"Chione cf. securis" = Securella securis, "Chione temblorensis" = Chione (Chionopsis) temblorensis
"Chione cf. securis" = Securella securis Shumard 1858 venus clam
"Chione temblorensis" = Chione (Chionopsis) temblorensis Anderson 1905 venus clam | |
Cardium sp. Linnaeus 1758 cockle | |
Thecostraca | |
"Balanus concavus" = Concavus concavus
"Balanus concavus" = Concavus concavus Bronn 1831 barnacle | |
Echinoidea | |
Echinoidea indet. Leske 1778 sea urchin | |
Mammalia | |
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