Also known as Medicine Rocks I

Where: Carter County, Montana (46.1° N, 104.5° W: paleocoordinates 51.8° N, 81.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Ekalaka Member (Fort Union Formation), Torrejonian (63.8 - 60.9 Ma)

• "The Medicine Rocks Sandstone, a unit that was originally mapped as part of the Tongue River Member of the Fort Union Formation. More recent work, however, has shown that the Medicine Rocks Sandstone is bounded by unconformities and it has thus been designated as its own unit, now called the Ekalaka Member of the Fort Union Formation YPM PU 16781 is from “Locality 1,” which Sloan (1970) grouped with other localities into an assemblage named Medicine Rocks I. A tentative Torrejonian 3 age is typically given on the basis of the mammalian assemblage found at that site (e.g., Lofgren et al. 2004)" (Joyce et al. 2009)

Environment/lithology: terrestrial; sandstone

Size class: mesofossils

Collection methods: surface (float)

Primary reference: R. Estes. 1976. Middle Paleocene lower vertebrates from the Tongue River Formation, southeastern Montana. Journal of Paleontology 50(3):500-520 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 14874: authorized by John Alroy, entered by John Alroy on 30.04.1994, edited by Philip Mannion, Patricia Holroyd and Matthew Carrano

Creative Commons license: CC BY (attribution)