Where: Inyo County, California (36.9° N, 118.1° W: paleocoordinates 5.8° S, 84.8° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Johnson Spring Formation, Middle Ordovician (470.0 - 458.4 Ma)

• "R. J. Ross, Jr. (written commun., 1962), placed the Johnson Spring Formation in the Wilderness Stage (immediately below the Trenton) of the Middle Ordovician. Langenheim and others (1956, p. 2093) considered that the "fauna has a general Blackriver-Trentonian aspect," but they seemed to favor a Trenton age. Pestana (1960, p. 864) also favored a Trenton age. The Johnson Spring Formation is thus considered Middle Ordovician, most probably middle or late Middle Ordovician."

• formation-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size classes: macrofossils, mesofossils, microfossils

Preservation: replaced with silica

Reposited in the USGS

Primary reference: D. C. Ross. 1966. Stratigraphy of some Paleozoic formations in the Independence quadrangle, Inyo County, California. United States Geological Survey Professional Paper 396:1-64 [J. Marcot/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 196188: authorized by Jonathan Marcot, entered by Jonathan Marcot on 06.09.2018

Creative Commons license: CC BY (attribution)