Where: Grand County, Colorado (40.2° N, 106.1° W: paleocoordinates 41.1° N, 101.9° W)
• coordinate based on political unit
When: Troublesome Formation, Early/Lower Miocene (23.0 - 16.0 Ma)
• lower part of "orange-gray siltstone and sandstone unit"
•ash bed at "presumably" the same level dated at 20.0 +/- 2.3 Ma FT on sphene and 18.0 +/- 2.0 Ma FT on zircon: Izett 1975
• group of beds-level stratigraphic resolution
Environment/lithology: terrestrial; gray sandstone
Size class: macrofossils
Primary reference: G. E. Lewis. 1969. United States Geological Survey Professional Paper 650-B [J. Alroy/J. Alroy]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 18978: authorized by John Alroy, entered by John Alroy on 27.09.1993
Creative Commons license: CC BY (attribution)
Taxonomic list
Mammalia | |
Merycochoerus matthewi Loomis 1924 oreodont | |
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Mesogaulus cf. paniensis Matthew 1902 rodent |