Where: Grand County, Colorado (40.2° N, 106.1° W: paleocoordinates 40.8° N, 103.2° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Troublesome Formation, Middle Miocene (16.0 - 11.6 Ma)

• Troublesome Formation is 23.5 to 11Ma according to dated tuffs at top and bottom (Izett & Obradovich 2001)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Reposited in the USGS

Primary reference: G. A. Izett and G. E. Lewis. 1963. Miocene vertebrates from Middle Park, Colorado. United States Geological Survey Professional Paper 475-B(31):B120-B122 [J. Alroy/J. Alroy/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 18977: authorized by John Alroy, entered by John Alroy on 15.05.2002

Creative Commons license: CC BY (attribution)