Big Red Horizon (TMM 40203) (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: Vieja Group, 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 16830: authorized by John Alroy, entered by John Alroy on 26.07.1994

Creative Commons license: CC BY (attribution)

Taxonomic list

• list probably complete
"5 to approximately 50 feet above the base of the Chambers Tuff" = Big Red Horizon: Wilson 1971a
"Poebrotherium franki" is NOT present: Wilson 1974 gives locality as "TMM 40203" but means TMM 40283 (see)
 Rodentia - Eutypomyidae
Eutypomys inexpectatus Wood 1974 rodent
 Rodentia - Ischyromyidae
Quadratomus gigans1 Wood 1974 rodent
 Rodentia - Cylindrodontidae
Pseudocylindrodon neglectus Burke 1935 rodent
 Perissodactyla - Brontotheriidae
Menops bakeri1 Stovall 1948 brontothere
 Perissodactyla - Hyracodontidae
Hyracodon medius1 Peterson 1934 odd-toed ungulate
 Perissodactyla - Equidae
Mesohippus texanus3 McGrew 1971 anchitheriine horse
additional Mesohippus sp. also present
 Ungulata - Agriochoeridae
Protoreodon pumilus4 Marsh 1875 agriochoerid
 Ungulata - Protoceratidae
Heteromeryx dispar5 Matthew 1905 protoceratid
Pseudoprotoceras minor1 Wilson 1974 protoceratid
 Ungulata - Leptomerycidae
Hendryomeryx defordi1 Wilson 1974 ruminant
 Hyaenodonta - Hyaenodontidae
Hyaenodon montanus2 Douglass 1902 eutherian