Also known as Wittecombe's Ranch

Where: Sweetgrass County, Montana (45.8° N, 109.8° W: paleocoordinates 45.8° N, 59.3° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Cloverly Formation, Valanginian to Valanginian (139.8 - 93.9 Ma)

• orig. assigned to Morrison, but outcrops in this area are exclusively Cloverly

•

•D'Emic et al. 2019: We reanalyzed published biostratigraphic, paleomagnetic, and radiometric datasets, which have generally disregarded younger (late Albian–Cenomanian) ages for the formation. New data reported in this study suggest that deposition of the Cloverly Formation spanned the Valanginian–Cenomanian stages (ca. 140 Ma–98 Ma), a longer time interval than the commonly cited Aptian–Albian depositional timeframe.

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by A. C. Silberling in 1903–1904; reposited in the CM

Collection methods: surface (float),

Primary reference: J. S. McIntosh. 1981. Annotated catalogue of the dinosaurs (Reptilia, Archosauria) in the collections of the Carnegie Museum of Natural History. Bulletin of Carnegie Museum of Natural History 18:1-67 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 142333: authorized by Matthew Carrano, entered by Matthew Carrano on 09.04.2013

Creative Commons license: CC BY (attribution)