LACMIP loc. 23312, Martinez (Cretaceous to of the United States)

Also known as UCLA loc. 3312

Where: Contra Costa County, California (38.0° N, 122.1° W: paleocoordinates 44.0° N, 97.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Great Valley Group, Early/Lower Maastrichtian to Early/Lower Maastrichtian (70.6 - 66.0 Ma)

• Great Valley Sequence. Age: “Mid“ Maastrichtian (late early to middle late).

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithology not reported

Size class: macrofossils

Collected by W. P. Popenoe in 1944; reposited in the LACM

Primary reference: R. L. Squires. 2011. A new genus of Cretaceous margaritine gastropod (Turbinidae) from the northeastern Pacific Ocean. The Nautilus 125(3):137-149 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 221990: authorized by Jonathan Marcot, entered by Jonathan Marcot on 04.09.2021

Creative Commons license: CC BY (attribution)

Taxonomic list

 Cardiida - Mactridae
Cymbophora ashburnerii2 Gabb 1864 clam
 Cardiida - Tancrediidae
"Meekia" navis3 Gabb 1864 clam
 Trochoidea - Turbinidae
Atira inornata, Igonoia muiri n. sp., "Margaritella angulata n. sp." = Igonoia angulata1
Atira inornata Gabb 1864 snail
Igonoia muiri n. sp. Squires 2011 snail
"Margaritella angulata n. sp." = Igonoia angulata1 Gabb 1869 snail