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, edited by Jonathan Marcot and Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Vetigastropoda - Discohelicidae
Discohelix sp. Dunker 1847 snail
 Neogastropoda - Clavatulidae
Surcula merriami Dickerson 1914 snail
Bivalvia
 Arcida - Glycymerididae
Glycymerita major Stanton 1896 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
 Cardiida - Veneridae
Paphia cf. clarki Dickerson 1914 venus clam
 Cardiida - Cardiidae
"Cardium cooperi" = Nemocardium (Nemocardium) linteum Conrad 1855 cockle
 Carditida - Crassatellidae
"Crassatellites unioides" = Crassatella unioides, "Crassatellites grandis" = Crassatella uvasana, "Crassatellites claytonensis n. sp." = Crassatella claytonensis
"Crassatellites unioides" = Crassatella unioides Stanton 1896 clam
"Crassatellites grandis" = Crassatella uvasana Conrad 1855 clam
"Crassatellites claytonensis n. sp." = Crassatella claytonensis Dickerson 1914 clam
 Nuculanida - Nuculanidae
"Leda packardi" = Nuculana (Saccella) packardi, "Leda gabbi" = Nuculana (Saccella) gabbii
"Leda packardi" = Nuculana (Saccella) packardi Dickerson 1914 pointed nut clam
"Leda gabbi" = Nuculana (Saccella) gabbii Conrad 1866 pointed nut clam