Big Red Horizon (Main Fossil Level) (Eocene of the United States)
Also known as TMM 40206; Main Fossil Level of Oklahoma University; Porvenir L.F. (in part)
Where: Presidio County, Texas (29.9° N, 104.2° W: paleocoordinates 31.6° N, 95.9° W)
• coordinate based on political unit
When: Chambers Tuff Formation, Duchesnean (39.7 - 37.0 Ma)
Environment/lithology: terrestrial
Reposited in the TMM
Primary reference: J. A. Wilson. 1977. Stratigraphic Occurrence and Correlation of Early Tertiary Vertebrate Faunas Trans-Pecos Texas. Part I: Vieja Area. Texas Memorial Museum Bulletin 25:1-42 [J. Alroy/J. Alroy/J. Marcot]more details
PaleoDB collection 16828: authorized by John Alroy, entered by John Alroy on 26.07.1994, edited by Patricia Holroyd
Creative Commons license: CC BY (attribution)
Taxonomic list
• basal 100 feet of section, below the "lower marker bed"
directly overlies Buckshot Ignimbrite, dated at 37.80 +/- 0.06 Ma SCLF AA on sanidine: Prothero and Swisher 1992; redated at 37.54 +/- 0.11 Ma (AA), see Prothero 1996b; a direct KA on sanidine date of 39.8 (= 41.0) +/- 2.8 Ma on the Chambers Tuff was reported by Wilson et al. 1968, but was ignored completely by Wilson 1977b, and listed erroneously as dating the "Candelaria local fauna" but not discussed in the text by Krishtalka et al. 1987; because it conflicts badly with the underlying Buckshot Ignimbrite date it appears to be useless
collection of Stovall 1948 is from TMM 40206: Wilson and Schiebout 1984; type of Ischnognathus savagei from the OU collection is said by Gustafson 1986b to be from "15 to 20 feet below the lower marker bed"
records that could pertain to TMM localities other than TMM 40206 are omitted; these are: "Leptotomus" gigans: TMM 40203 "Ischyrotomus" cf. petersoni: TMM 40202 Hemipsalodon viejaensis: TMM 40263 Protoreodon pumilus: TMM 40203 Heteromeryx dispar: TMM 40203
identity of "Caenopus sp." is completely ambiguous as genus is invalid and no useful comparisons are drawn by Wilson and Schiebout 1984; FMNH specimen
entelodont of Stovall is omitted by Wilson
directly overlies Buckshot Ignimbrite, dated at 37.80 +/- 0.06 Ma SCLF AA on sanidine: Prothero and Swisher 1992; redated at 37.54 +/- 0.11 Ma (AA), see Prothero 1996b; a direct KA on sanidine date of 39.8 (= 41.0) +/- 2.8 Ma on the Chambers Tuff was reported by Wilson et al. 1968, but was ignored completely by Wilson 1977b, and listed erroneously as dating the "Candelaria local fauna" but not discussed in the text by Krishtalka et al. 1987; because it conflicts badly with the underlying Buckshot Ignimbrite date it appears to be useless
collection of Stovall 1948 is from TMM 40206: Wilson and Schiebout 1984; type of Ischnognathus savagei from the OU collection is said by Gustafson 1986b to be from "15 to 20 feet below the lower marker bed"
records that could pertain to TMM localities other than TMM 40206 are omitted; these are: "Leptotomus" gigans: TMM 40203 "Ischyrotomus" cf. petersoni: TMM 40202 Hemipsalodon viejaensis: TMM 40263 Protoreodon pumilus: TMM 40203 Heteromeryx dispar: TMM 40203
identity of "Caenopus sp." is completely ambiguous as genus is invalid and no useful comparisons are drawn by Wilson and Schiebout 1984; FMNH specimen
entelodont of Stovall is omitted by Wilson
Show authors, comments, and common names
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"Poabromylus minor" = Pseudoprotoceras minor, Poabromylus kayi
"Poabromylus minor" = Pseudoprotoceras minor Wilson 1974 protoceratid | |
"Leptomeryx defordi n. sp." = Hendryomeryx defordi
"Leptomeryx defordi n. sp." = Hendryomeryx defordi Wilson 1974 ruminant | |
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Agriochoerus antiquus Leidy 1850 agriochoerid OU: Wilson 1971a; includes "Merycoidodon culbertsoni" of Stovall
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"Menodus bakeri n. sp." = Menops bakeri Stovall 1948 brontothere | |
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Mesohippus sp. Marsh 1875 anchitheriine horse
Haplohippus texanus McGrew 1953 horse | |
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"Manitsha johanniculi" = Pseudotomus johanniculi
"Manitsha johanniculi" = Pseudotomus johanniculi Wood 1974 rodent | |
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| Gastropoda | |
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