Adam Risley Ranch (Miocene of the United States)

Also known as Adam Rizley Ranch

Where: Donley County, Texas (35.0° N, 100.8° W: paleocoordinates 35.3° N, 99.1° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Late/Upper Miocene (11.6 - 5.3 Ma)

• Said to be "Pliocene" in the archaic VP sense of the term.

• bed-level stratigraphic resolution

Environment/lithology: fluvial; sandstone

• "pebbles and sand grains are rounded, showing that the sediments are of fluvial origin"
• "fossil-bearing stratum of buff sand"

Size class: macrofossils

Collection methods: quarrying,

Primary reference: C. S. Johnston and W. G. Christian. 1941. Pliocyon walkerae, a new Pliocene canid from Texas. Journal of Paleontology 15(1):56-60 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 18346: authorized by John Alroy, entered by John Alroy on 05.08.1992, edited by Jonathan Marcot

Creative Commons license: CC BY (attribution)

Taxonomic list

• Multiple family names are given, but most material presumably is generically determinate.
Reptilia
 Testudines - Pantestudinidae
Testudinidae indet.1 Batsch 1788 turtle
Mammalia
 Perissodactyla - Equidae
Equidae indet., "Hippotigris clarendonensis n. sp." = Protohippus supremus2
Equidae indet. Gray 1821 horse
"Hippotigris clarendonensis n. sp." = Protohippus supremus2 Leidy 1869 horse
 Carnivora - Amphicyonidae
Ischyrocyon gidleyi3 Matthew 1902 bear-dog
 Carnivora - Canidae
Cynarctus crucidens1 Barbour and Cook 1914 bone-crushing dog
 Carnivora - Felidae
? Pseudaelurus sp.3 Leidy 1858 cat
"a few other unidentified carnivores"
 Ungulata - Camelidae
Camelidae indet. Gray 1821 camel
 Ungulata - Antilocapridae
Antilocapridae indet. Gray 1866 pronghorn