Darke County Megalonyx Site (Pleistocene of the United States)

Where: Darke County, Ohio (40.2° N, 84.7° W: paleocoordinates 40.2° N, 84.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Late/Upper Pleistocene (0.1 - 0.0 Ma)

• "A date of 12,190 +/- 215 years B. P. was determined" for a "wood fragment (Picea)"

• group of beds-level stratigraphic resolution

Environment/lithology: mire or swamp; poorly lithified marl

• from "one of the kettle bogs" on the property
• "dredged up chunks of marl"

Size classes: macrofossils, mesofossils

Collected by L. Carter, R. S. Mills in 1966, 1973

Collection methods: bulk, salvage, quarrying, sieve,

• Dayton Museum of Natural History collection

•after the initial discovery "Museum personnel and volunteers dug through dredged up marl using hand tools" and a "3783 c.c. sample of marl was analyzed for mollusc shells"

Primary reference: R. S. Mills. 1975. A ground sloth, Megalonyx, from a Pleistocene site in Darke Co, Ohio. Ohio Journal of Science 75(3):147-155 [J. Alroy/J. Alroy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 93208: authorized by John Alroy, entered by John Alroy on 07.01.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

 Cardiida - Sphaeriidae
Sphaerium sp. Scopoli 1777 fingernail clam
 Rissooidea - Amnicolidae
Amnicola sp. Gould and Haldeman 1841 snail
 Basommatophora - Planorbidae
 Basommatophora - Physidae
 Basommatophora - Lymnaeidae
Fossaria sp. Westerlund 1885 pulmonate
 Valvatoidea - Valvatidae
 Rodentia - Cricetidae
Ondatra zibethicus Linnaeus 1766 muskrat
 Rodentia - Castoridae
Castor canadensis Kuhl 1820 American beaver
 Xenarthra - Megalonychidae
Megalonyx jeffersonii Desmarest 1822 Jefferson's ground sloth
 Ungulata - Cervidae
Odocoileus virginianus Zimmermann 1780 white-tailed deer
 Pinales - Pinaceae
Picea sp. Link 1827 spruce