ammonites
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near Vallecito (Stylemys calaverensis type locality) (Miocene of the United States)

Where: Calaveras County, California (38.1° N, 120.5° W: paleocoordinates 37.9° N, 115.7° W)

• coordinate based on nearby landmark

When: Miocene (23.0 - 5.3 Ma)

Environment/lithology: terrestrial; gravel

• Auriferous gravels. The gravel in which the specimen was found contains small fragments of rhyolite tuff, but no pebbles of the later volcanic rocks of the Sierra Nevada. The gravels are overlain by a white rhyolite tuff, exposed at the top of the high bank above the mine pit. The tuffs are overlain by a gravel containing abundant andesite pebbles, and the section is capped by a sheet of augite-latite, a part of the Tuolumne Table Mountain flow described by Dr. Ransome.

Size class: macrofossils

Collected by essrs. Sloan and Rudorf; reposited in the UCMP

• It was discovered by Messrs. Sloan and Rudorf, the proprietors of the "Old Stiff" gravel mine, on Balaklava Hill.

Primary reference: W. J. Sinclair. 1903. A new tortoise from the auriferous gravels of California. Bulletin of the Departement of Geology, University of California Press 3(11):243-248 [E. Vlachos/E. Vlachos] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 191834: authorized by Evangelos Vlachos, entered by Evangelos Vlachos on 16.02.2018

Creative Commons license: CC BY (attribution)