Also known as Loc. 23
Where: Baja California Sur, Mexico (28.9° N, 114.0° W: paleocoordinates 28.0° N, 107.6° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Upper Member (Ysidro Formation), Early/Lower Miocene (23.0 - 16.0 Ma)
• Collection from a bed of marl in the upper part of the Ysidro Formation. 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. Faun correlated to the Temblor of California, and possibly the Vaqueros of California, although a lower Temblor age (early Miocene) is preferred
• bed-level stratigraphic resolution
Environment/lithology: marine; marl
Size class: macrofossils
Collection methods: quarrying,
• Collection studied and determined by Herlein and Jordan (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 43814: authorized by Austin Hendy, entered by Austin Hendy on 26.08.2004
Creative Commons license: CC BY (attribution)
Taxonomic list
Echinoidea | |
"Scutella norrisi" = Vaquerosella coreyi
"Scutella norrisi" = Vaquerosella coreyi Durham 1955 sand dollar | |
Bivalvia | |
"Mytilus cf. mathewsonii" = Crenomytilus mathewsoni
"Mytilus cf. mathewsonii" = Crenomytilus mathewsoni Gabb 1866 mussel | |
"Metis alta" = Leporimetis obesa
"Metis alta" = Leporimetis obesa Deshayes 1855 tellin clam | |
"Sanguinolaria toulai" = Nuttallia toulai
"Sanguinolaria toulai" = Nuttallia toulai Hertlein and Jordan 1927 clam | |
"Chione richthofeni" = Chione (Chionopsis) richthofeni, Amiantis aff. communis, Saxidomus cf. vaquerosensis
"Chione richthofeni" = Chione (Chionopsis) richthofeni Hertlein and Jordan 1927 venus clam
Amiantis aff. communis Nomland 1917 venus clam
Saxidomus cf. vaquerosensis Arnold 1909 venus clam | |
Gastropoda | |
Calliostoma hannibali Hertlein and Jordan 1927 top snail | |
"Turritella ocoyana" = Turritella ocoyana, "Turritella bosei" = Turritella ocoyana
"Turritella ocoyana" = Turritella ocoyana Conrad 1855 turret shell
"Turritella bosei" = Turritella ocoyana Conrad 1855 turret shell | |
"Polinices recluzianus" = Glossaulax reclusiana
"Polinices recluzianus" = Glossaulax reclusiana Deshayes 1839 moon snail | |
"Cypraea amandusi" = Siphocypraea amandusi
"Cypraea amandusi" = Siphocypraea amandusi Hertlein and Jordan 1927 cowry | |
Macron hartmanni Hertlein and Jordan 1927 snail | |
Terebra burckhardti Hertlein and Jordan 1927 auger snail | |
Cymia heimi Hertlein and Jordan 1927 murex snail
Thais wittichi Hertlein and Jordan 1927 murex snail | |
Crassispira starri Hertlein and Jordan 1927 snail | |
Calyptraea inornata Gabb 1869 slipper shell | |
Thecostraca | |
"Balanus aff. californicus" = Balanus tintinnabulum californicus
"Balanus aff. californicus" = Balanus tintinnabulum californicus Pilsbry 1916 barnacle |