Where: Wheatland County, Montana (46.5° N, 109.4° W: paleocoordinates 53.6° N, 76.3° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: McClelland Ferry Member (Judith River Formation), Middle Campanian (83.5 - 70.6 Ma)

• in the lower 1/3rd of the local section according to Penkalski and Dodson 1999

•

•Rogers et al. 2016: This mid-Judith discontinuity defines the boundary between the new McClelland Ferry and overlying Coal Ridge Members of the Judith River Formation. The shallow marine sandstones that form the backstepping sequences represent the leading edge of the Bearpaw transgression in this region and are formalized as the new Woodhawk Member of the Judith River Formation in a third reference section. New 40Ar/39Ar ages indicate (1) that the mid-Judith discontinuity formed ∼76.2 Ma,

• bed-level stratigraphic resolution

Environment/lithology: "channel"; sandstone

Size classes: macrofossils, mesofossils

Collected by E. Cole & P. Dodson in 1981-1986

Collection methods: bulk, quarrying, surface (float), sieve,

Primary reference: P. Dodson. 1984. Small Judithian ceratopsids, Montana and Alberta. In W.-E. Reif & F. Westphal (eds.), Third Symposium on Mesozoic Terrestrial Ecosystems, Short Papers. Attempto Verlag, Tübingen 73-78 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 14437: authorized by John Alroy, entered by John Alroy on 21.09.1998, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)