Eastern Tornillo Flat (Paleocene of the United States)

Also known as T2; TMM 40147; Middle Peak; Alligator Alley

Where: Brewster County, Texas (29.4° N, 103.1° W: paleocoordinates 35.3° N, 84.7° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Black Peaks Formation (Tornillo Group), Torrejonian (63.8 - 60.9 Ma)

• 140 ft above base of formation; Torrejonian based on Leslie et al. (2018)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Collected by J. Wilson, M. McKenna, G. Whitaker in 1952, 1962–1963; reposited in the TMM

Collection methods: surface (in situ),

Primary reference: J. A. Wilson. 1967. Early Tertiary mammals. In R. A. Maxwell, J. T. Lonsdale, R. T. Hazzard, & J. A. Wilson (eds.), Geology of Big Bend National Park, Brewster County, Texas. The University of Texas Publication 6711:157-169 [M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14948: authorized by John Alroy, entered by John Alroy on 18.02.1993, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

• 43 m level of Fm.
new records of Williamson 1996 were described by Schiebout 1986 (Ph.D. thesis)
 Theriamorpha - Phenacodontidae
Phenacodus bisonensis4 Gazin 1956 condylarth
BEG 40147-19
 Acreodi - Oxyclaenidae
Prothryptacodon sp.5 Simpson 1935 placental
 Theriamorpha - Periptychidae
Periptychus sp.6 Cope 1881 condylarth
BEG 40417-4, 17
 Theriamorpha - Mixodectidae
Mixodectes malaris5 Cope 1884 placental
 Primates -
Palaechthon cf. woodi5 Gazin 1971 primate
apparently "Navajovius kohlhaasae"
 Theriamorpha - Stylinodontidae
Psittacotherium multifragum3 Cope 1882 taeniodont
BEG 40147-2, 3, 3a, 3b, 7
 Multituberculata - Neoplagiaulacidae
Mesodma cf. pygmaea1 Sloan 1987 multituberculate
Mimetodon silberlingi2 Simpson 1935 multituberculate
Parectypodus sloani2 Schiebout 1974 multituberculate
Ectypodus musculus2 Matthew and Granger 1921 multituberculate
 Multituberculata - Ptilodontidae
Ptilodus mediaevus2, "Neoplagiaulax douglassi" = Baiotomeus douglassi2
Ptilodus mediaevus2 Cope 1881 multituberculate
"Neoplagiaulax douglassi" = Baiotomeus douglassi2 Simpson 1935 multituberculate
BEG 40147-15