Also known as CAS 54135, CAS 54126, CAS 57867

Where: Sonoma County, California (38.3° N, 122.8° W: paleocoordinates 38.2° N, 120.4° W)

• coordinate estimated from map

When: Wilson Grove Formation, Tortonian to Tortonian (11.6 - 2.6 Ma)

• The data presented above indicate that the lower part (below the Roblar tuff) of the Wilson Grove Formation is late Miocene in age, between <9.27±0.06 Ma and >6.203±0.011 Ma, whereas in its upper part (above the Roblar tuff) an age range between 6.203±0.011 Ma to possibly as young as

•>2.6 Ma (late Pliocene; Powell and others, 2004) is deter- mined. This age range includes the “Jacalitos” CPMS for the lower unit to possibly the “San Joaquin” CPMS for the upper unit and overall overlaps the upper part of the Tortonian and lower part of the Messinian to the Piacenzian stages of the International Chronostratigraphic Chart (International Com- mission on Stratigraphy, 2012).

Environment/lithology: shallow subtidal; medium-grained, calcareous sandstone

Size class: macrofossils

Primary reference: C. L. Powell, R. W. Boessenecker, N. A. Smith, R. J. Fleck, S. J. Carlson, J. R. Allen, D. J. Long, A. M. Sarna-Wojcicki, and R. B. Guruswami-Naidu. 2019. Geology and Paleontology of the Late Miocene Wilson Grove Formation at Bloomfield Quarry, Sonoma County, California. Scientific Investigations Report 2019(5021):1-77 [M. Uhen/B. Shipps/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 188305: authorized by Mark Uhen, entered by Mark Uhen on 28.08.2017

Creative Commons license: CC BY (attribution)