Tom's Top (Paleocene of the United States)

Also known as LSUMG 11; LSUMG V-111; TMM 41400

Where: Brewster County, Texas (29.3° N, 103.6° W: paleocoordinates 35.5° N, 84.3° W)

• coordinate based on political unit

When: Javelina Formation (Tornillo Group), Puercan (66.0 - 63.3 Ma)

• said to be late Puercan based on undescribed species, but Torrejonian by Williamson 1996

•at 160 m level of Mbr., but position relative to Dogie Mountain unclear

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Reposited in the TMM

Primary reference: J. A. Schiebout and Et al. 1987. Stratigraphy of the Cretaceous-Tertiary and Paleocene-Eocene Transition Rocks of Big Bend National Park, Texas . Journal of Geology 95 [J. Alroy/J. Alroy/J. Ju]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 14887: authorized by John Alroy, entered by John Alroy on 15.05.2002, edited by Patricia Holroyd

Creative Commons license: CC BY (attribution)

Taxonomic list

• the two LSUMG locality numbers appear to refer to the same locality

•two of "three new mammalian taxa" are discussed by Williamson 1996, but not the third

 Proteida - Batrachosauroididae
Opisthotriton kayi2 Auffenberg 1961 salamander
 Caudata - Urodela
Habrosaurus sp.2 Gilmore 1928 siren
 Primates - Palaechthonidae
Plesiolestes nacimienti1 Wilson and Szalay 1972 primate
 Ferae -
Carnivora indet.4 Bowditch 1821 carnivoran
 Ungulata - Hyopsodontidae
Promioclaenus sp.4 Trouessart 1904 condylarth
 Insectivora - Mixodectidae
Mixodectes malaris Cope 1884 insectivoran
 Multituberculata - Eucosmodontidae
Stygimys vastus n. sp.3 Lofgren et al. 2005 multituberculate