Mississippi Lime and Material Company Plant No. 2: Late/Upper Pleistocene, Illinois
collected by W. McAdams
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia
- Rodentia
- Sciuridae
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Marmota monax
(Linnaeus 1758)
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Mammalia
- Rodentia
- Geomyidae
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Geomys bursarius
(Shaw 1800)
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Mammalia
- Rodentia
- Castoridae
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Castor canadensis
Kuhl 1820
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Castoroides ohioensis
Foster 1838
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Mammalia
- Perissodactyla
- Equidae
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Equus sp.
Linnaeus 1758
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Mammalia
- Tayassuidae
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Platygonus ? cumberlandensis
Gidley 1920
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synonym of Platygonus vetus | |||||||
Mammalia
- Cervidae
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Cervalces ? roosevelti
Hay 1913
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synonym of Cervalces latifrons | |||||||
Rangifer muscatinensis
Leidy 1879
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synonym of Rangifer tarandus | |||||||
Sangamona fugitiva
Hay 1920
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nomen vanum belonging to Cervidae | |||||||
Mammalia
- Bovidae
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Symbos promptus
Hay 1920
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synonym of Bootherium bombifrons | |||||||
Taurotragus americanus
Gidley 1913
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recombined as Euceratherium americanum | |||||||
Mammalia
- Carnivora
- Ursidae
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Ursus americanus
Pallas 1780
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Mammalia
- Megalonychidae
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Megalonyx jeffersonii
(Desmarest 1822)
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Mammalia
- Proboscidea
- Mammutidae
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Mammut americanum
(Kerr 1792)
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see common names |
Geography
Country: | United States | State/province: | Illinois |
Coordinates: | 38.9° North, 90.2° West (view map) | ||
Paleocoordinates: | 38.9° North, 90.2° West | ||
Basis of coordinate: | based on nearby landmark | ||
Geographic resolution: | small collection |
Time
Period: | Quaternary | Epoch: | Pleistocene |
10 m.y. bin: | Cenozoic 6 | ||
Key time interval: | Late/Upper Pleistocene | ||
Age range of interval: | 0.12600 - 0.01170 m.y. ago |
Stratigraphy
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: age of loess is thought to be either "Sangamon" or (younger and therefore) "Peorian" |
Lithology and environment
Primary lithology: | concretionary conglomerate |
Lithology description: "In the contact zone between the [glacial, 1-3 feet thick] till and the [reddish] loess" in the local section; the loess has "no notable quantity of sand or suggestion of stratification" while the till is "reddish [and] contains many erratic pebbles of granite, dolerite, greenstone, quartzite, and other Canadian rocks, and also some local rocks"; the glacial till lies immediately over a limestone | |
Environment: | pond |
Geology comments: the "loess" is "doubtless aeolian in origin" but the fossils are thought to have been entrapped in "ponds" formed in "a gentle depression at the top of the limestone," which makes sense only if the sequence was glaciation followed by pond formation/fossilization followed by loess deposition |
Taphonomy
Modes of preservation: | body,concretion |
Size of fossils: | macrofossils |
Collection methods and comments
Collection methods: | survey of museum collection |
Reason for describing collection: | biostratigraphic analysis |
Museum repositories: | USNM |
Collectors: | W. McAdams |
Collection method comments: McAdams collection was made "Some time previous to 1883" | |
Taxonomic list comments:mammal identifications were made by O. P. Hay (may the buyer beware)
Polygyra prounda pleistocenica Baker (new ssp.) Polygyra multilineata altonensis Baker (n. ssp.) are both found throughout the lower loess overlying the fossiliferous zone |
Metadata
Also known as: | Alton | ||
Database number: | 93486 | ||
Authorizer: | J. Alroy | Enterer: | J. Alroy |
Modifier: | M. Uhen | Research group: | vertebrate |
Created: | 2010-01-19 20:13:55 | Last modified: | 2020-12-09 16:45:36 |
Access level: | the public | Released: | 2010-01-19 20:13:55 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
31631. | 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] |
Secondary references:
74680 | A. R. Cahn. 1932. Records and distribution of the fossil Beaver, Castoroides ohioensis. Journal of Mammalogy 13(3):229-241 [M. Uhen/M. Uhen] |