Also known as Alton
Where: Illinois (38.9° N, 90.2° W: paleocoordinates 38.9° N, 90.2° W)
• coordinate based on nearby landmark
• small collection-level geographic resolution
When: Late/Upper Pleistocene (0.1 - 0.0 Ma)
• age of loess is thought to be either "Sangamon" or (younger and therefore) "Peorian"
• bed-level stratigraphic resolution
Environment/lithology: pond; concretionary conglomerate
Size class: macrofossils
Preservation: concretion
Collected by W. McAdams; reposited in the USNM
• McAdams collection was made "Some time previous to 1883"
Primary reference: M. M. Leighton. 1921. The Pleistocene succession near Alton, Illinois, and the age of the mammalian fossil fauna. Journal of Geology 29(6):505-514 [J. Alroy/J. Alroy]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 93486: authorized by John Alroy, entered by John Alroy on 19.01.2010
Creative Commons license: CC BY (attribution)
Taxonomic list
•Polygyra prounda pleistocenica Baker (new ssp.) Polygyra multilineata altonensis Baker (n. ssp.) are both found throughout the lower loess overlying the fossiliferous zone
Mammalia | |
Marmota monax Linnaeus 1758 groundhog | |
Geomys bursarius Shaw 1800 plains pocket gopher | |
Castor canadensis Kuhl 1820 American beaver
Castoroides ohioensis Foster 1838 giant beaver | |
Equus sp. Linnaeus 1758 horse | |
"Platygonus ? cumberlandensis" = Platygonus vetus
"Platygonus ? cumberlandensis" = Platygonus vetus Leidy 1882 peccary | |
"Cervalces ? roosevelti" = Cervalces latifrons, "Rangifer muscatinensis" = Rangifer tarandus, Sangamona fugitiva
"Cervalces ? roosevelti" = Cervalces latifrons Johnson 1874 stag moose
"Rangifer muscatinensis" = Rangifer tarandus Linnaeus 1758 reindeer
Sangamona fugitiva Hay 1920 deer | |
"Symbos promptus" = Bootherium bombifrons, "Taurotragus americanus" = Euceratherium americanum
"Symbos promptus" = Bootherium bombifrons Harlan 1825 antelope
"Taurotragus americanus" = Euceratherium americanum Gidley 1913 shrub-ox | |
Ursus americanus Pallas 1780 black bear | |
Megalonyx jeffersonii Desmarest 1822 Jefferson's ground sloth | |
Mammut americanum Kerr 1792 American mastodon |