Big Red Horizon (TMM 40202) (Eocene of the United States)

Where: Presidio County, Texas (29.9° N, 104.2° W: paleocoordinates 31.6° N, 95.9° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Chambers Tuff Formation, Duchesnean (40.4 - 37.2 Ma)

Environment/lithology: terrestrial

Reposited in the TMM

Primary reference: A. E. Wood. 1974. Early Tertiary vertebrate faunas, Vieja Group Trans-Pecos Texas: Rodentia. Texas Memorial Museum Bulletin 21:1-112 [J. Alroy/J. Alroy/M. Uhen]more details

PaleoDB collection 16829: authorized by John Alroy, entered by John Alroy on 26.07.1994

Creative Commons license: CC BY (attribution)

Taxonomic list

• definitely in the Chambers Tuff and presumed to be from the Big Red Horizon because I. cf. petersoni appears in list of Wilson 1977b for this interval
Mammalia
 Rodentia - Ischyromyidae
Pseudotomus cf. petersoni1 Matthew 1910 rodent
 Perissodactyla - Hyracodontidae
Hyracodon medius1 Peterson 1934 odd-toed ungulate
 Perissodactyla - Equidae
Mesohippus texanus2 McGrew 1971 anchitheriine horse
 Ungulata - Protoceratidae
Heteromeryx dispar3 Matthew 1905 protoceratid