Also known as Lower Quarry; Trigonias Quarries; Upper Quarry; Weld County Quarry
Where: Weld County, Colorado (40.8° N, 103.7° W: paleocoordinates 42.2° N, 95.2° W)
• coordinate stated in text
• outcrop-level geographic resolution
When: Chadron Formation, Chadronian (37.2 - 33.9 Ma)
• "probably equivalent to an early phase of the typical Titanotherium beds of the South Dakota Oligocene" (Wood 1931)
• member-level stratigraphic resolution
Environment/lithology: fluvial-lacustrine; volcaniclastic sediments
Size class: macrofossils
Collection methods: Denver Museum of Natural History collection
Primary reference: W. K. Gregory and H. J. Cook. 1928. New material for the study of evolution: a series of primitive rhinoceros skulls (Trigonias) from the Lower Oligocene of Colorado. Proceedings of the Colorado Museum of Natural History 8(1):1-32 [J. Alroy/J. Alroy]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 99642: authorized by John Alroy, entered by John Alroy on 17.11.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
Mammalia | |
"Trigonias osborni" = Trigonias osborni, "Trigonias preoccidentalis n. sp." = Trigonias osborni, "Caenopus premitis n. sp." = Trigonias osborni, "Trigonias precopei n. sp." = Trigonias osborni, "Trigonias hypostylus n. sp." = Trigonias osborni, "Trigonias taylori n. sp." = Trigonias osborni
"Trigonias osborni" = Trigonias osborni Lucas 1900 rhinoceros types of "T. osborni secundus" and "T. osborni figginsi"
"Trigonias preoccidentalis n. sp." = Trigonias osborni Lucas 1900 rhinoceros
"Caenopus premitis n. sp." = Trigonias osborni Lucas 1900 rhinoceros
"Trigonias precopei n. sp." = Trigonias osborni Lucas 1900 rhinoceros
"Trigonias hypostylus n. sp." = Trigonias osborni Lucas 1900 rhinoceros
"Trigonias taylori n. sp." = Trigonias osborni Lucas 1900 rhinoceros | |
Aves | |
Palaeocrex fax n. gen. n. sp.
Palaeocrex fax n. gen. n. sp. Wetmore 1927 rail | |
Bathornis veredus n. gen. n. sp.
Bathornis veredus n. gen. n. sp. Wetmore 1927 bird | |
Phasmagyps patritus n. gen. n. sp., Palaeogyps prodromus n. gen. n. sp.
Phasmagyps patritus n. gen. n. sp. Wetmore 1927 vulture
Palaeogyps prodromus n. gen. n. sp. Wetmore 1927 vulture |