Hansen Bluff CG (Pleistocene of the United States)

Also known as Alamosa

Where: Alamosa County, Colorado (37.4° N, 105.8° W: paleocoordinates 37.4° N, 105.8° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Alamosa Formation, Middle Pleistocene (0.8 - 0.1 Ma)

• bed-level stratigraphic resolution

Environment/lithology: fine channel fill; sandstone

• "in stream channels or in small, lake-filled relict channels"

Size class: mesofossils

Collection methods: bulk, sieve,

Primary reference: K. L. Rogers, C. A. Repenning, R. M. Forester, E. E. Larson, S. A. Hall, G. R. Smith, E. Anderson and T. J. Brown. 1985. Middle Pleistocene (late Irvingtonian: Nebraskan) climatic changes in south-central Colorado. National Geograpic Research 1(4):535-563 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 20358: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• paleomag is normal high in section and reversed low in section; Bishop Ash equivalent is at base of normal section; correlated with Matuyama Chron (R) and Brunhes Chron (N)
Show authors, comments, and common names
Amphibia
 Salientia - Pelobatidae
"Scaphiopus bombifrons" = Spea bombifrons
"Scaphiopus bombifrons" = Spea bombifrons Cope 1863 Plains spadefoot
 Salientia - Ranidae
Rana sp.
Rana sp. Linnaeus 1758 frog
 Caudata - Urodela
Ambystoma tigrinum
Ambystoma tigrinum Green 1825 tiger salamander
Aves
 Anseriformes - Anatidae
Aythya affinis
Aythya affinis Eyton 1838 lesser scaup
Reptilia
 Squamata - Colubridae
Pituophis melanoleucus, Thamnophis sirtalis2
Pituophis melanoleucus Daudin 1803 pine snake
Thamnophis sirtalis2 Linnaeus garter snake
 Squamata -
Lacertilia indet.2
Lacertilia indet.2 lizard
"Lizard sp."
Mammalia
 Perissodactyla - Equidae
Equus sp.
Equus sp. Linnaeus 1758 horse
 Artiodactyla - Camelidae
Camelops sp.
Camelops sp. Leidy 1854 camel
 Artiodactyla - Antilocapridae
Antilocapridae indet.
Antilocapridae indet. Gray 1866 pronghorn
 Lagomorpha - Leporidae
Leporidae indet.
Leporidae indet. Fischer de Waldheim 1817 rabbit
 Rodentia - Cricetidae
"Terricola meadensis" = Microtus meadensis1, Microtus paroperarius
"Terricola meadensis" = Microtus meadensis1 Hibbard 1944 vole
Microtus paroperarius Hibbard 1944 vole
 Rodentia - Sciuridae
Cynomys sp.
Cynomys sp. Rafinesque 1817 prairie dog
 Rodentia - Geomyidae
Geomys sp.
Geomys sp. Rafinesque 1817 pocket gopher
1Alroy 2002; 2Rogers 1987