UCMP 1558 (Paleocene of the United States)

Where: Contra Costa County, California (38.0° N, 122.2° W: paleocoordinates 43.9° N, 100.0° W)

• coordinate based on nearby landmark

When: Martinez Formation, Paleocene (66.0 - 56.0 Ma)

• Martinez Fm. discussed as Eocene by Dickerson 1914, but rocks now regarded as Paleocene following Stewart, Ralph, 1949, Lower Tertiary stratigraphy of Mount Diablo, Marysville Buttes, and west border of lower Central Valley of California: U.S. Geological Survey Oil and Gas Investigations Preliminary Chart, OC-34.

Environment/lithology: marine; lithology not reported

Size classes: macrofossils, mesofossils

Reposited in the UCMP

Primary reference: R. E. Dickerson. 1914. Fauna of the Martinez Eocene of California. Bulletin of the Department of Geology, University of California 6:61-180 [P. Holroyd/P. Holroyd/A. Hendy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 190780: authorized by Patricia Holroyd, entered by Patricia Holroyd on 17.12.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Arcida - Glycymerididae
"Glycimeris veatchii" = Axinaea veatchii
"Glycimeris veatchii" = Axinaea veatchii Gabb 1864 clam
 Pectinida - Limidae
"? Lima claytonensis n. sp." = Limea (Isolimea) claytonensis
"? Lima claytonensis n. sp." = Limea (Isolimea) claytonensis Dickerson 1914 file clam
 Mytilida - Mytilidae
Modiolus sp. Lamarck 1801 mussel
 Carditida - Crassatellidae
"Crassatellites unioides" = Crassatella, Crassatellites grandis, Crassatellites claytonensis n. sp.
"Crassatellites unioides" = Crassatella clam
Crassatellites grandis Gabb 1864 clam
Crassatellites claytonensis n. sp. Dickerson 1914 clam
 Cardiida - Veneridae
Paphia cf. clarki Dickerson 1914 venus clam
 Cardiida - Cardiidae
"Cardium cooperi" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
 Protobranchia - Nuculanidae
"Leda gabbi" = Nuculana (Saccella) gabbii, "Leda packardi n. sp." = Saccella packardi
"Leda gabbi" = Nuculana (Saccella) gabbii Conrad 1869 pointed nut clam
"Leda packardi n. sp." = Saccella packardi Forbes 1848 pointed nut clam
Gastropoda
 Vetigastropoda - Discohelicidae
Discohelix sp. Dunker 1847 snail