Also known as UCMP V-74110
Where: Garfield County, Montana (47.6° N, 107.0° W: paleocoordinates 53.9° N, 81.8° W)
• coordinate based on political unit
• small collection-level geographic resolution
When: Tullock Formation, Puercan (66.0 - 63.3 Ma)
• bed-level stratigraphic resolution
Environment/lithology: coarse channel fill; sandstone
Size class: mesofossils
Reposited in the UCMP
Collection methods: bulk, surface (float), sieve,
Primary reference: J. D. Archibald. 1981. The earliest known Palaeocene mammal fauna and its implications for the Cretaceous–Tertiary transition. Nature 291:650-652 [J. Alroy/J. Alroy/J. Ju]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 14742: authorized by John Alroy, entered by John Alroy on 15.05.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
between the IrZ and HFZ coals and seems NOT to include reworked specimens: Swisher et al. 1993; dates on these coals are:
IrZ = 65.16 +/- 0.04 Ma
HFZ = 64.77 +/- 0.06 Ma
average is 64.965 Ma
see also Dalrymple et al. 1993, who give a mean of 26 K-T dates of 64.6 +/- 0.1 Ma
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"Mesodma garfieldensis" = Mesodma thompsoni2
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