UCMP B-2229, San Lorenzo River (Eocene of the United States)

Where: Santa Cruz County, California (37.2° N, 122.1° W: paleocoordinates 36.8° N, 110.1° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Butano Formation, Bartonian (41.3 - 38.0 Ma)

• Stratigraphically 115 feet below top of Butano formation, at stream level, in 1-inch black siltstone stringer at top of a 2-foot bed of alternating coarse and fine-grained siltstone.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified siltstone

Size class: macrofossils

Reposited in the UCMP

Primary reference: F. R. Sullivan. 1962. Foraminifera from the type section of the San Lorenzo Formation, Santa Cruz County, California. University of California Publications in Geological Sciences 37(4):233-352 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 186057: authorized by Matthew Clapham, entered by Matthew Clapham on 07.06.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

  - Chilostomellidae
 Rotaliina - Cassidulinidae
Cassidulina cf. diversa Cushman and Stone 1949
 Discorbacea - Bagginidae
Valvulineria cf. wilcoxensis Cushman and Ponton 1932
Valvulineria tumeyensis Cushman and Simonson 1944
Cancris mexicanus Cushman and Todd 1942
 Rotaliina - Bolivinidae
Bolivina gracilis Cushman and Applin 1926
ssp. incisurata
 Globigerinaceae - Globigerinidae
Amphimorphina ignota Cushman and Siefgus 1939
 Textulariina - Prolixoplectidae
Plectina garzaensis Cushman and Siegfus 1935
 Miliolida - Spiroloculinidae