Also known as MOR HC-557; MSHC4; Lone Tree Creek; south of Fort Peck reservoir

Where: Garfield County, Montana (47.6° N, 106.4° W: paleocoordinates 54.3° N, 79.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Hell Creek Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• ~12 m below the contact with the Fort Union Fm, which is visible in the cliffs above the site, placing HC-557 in the lower part of the upper third of the Hell Creek Formation, between the Apex and Ten Meter Sandstones

• bed-level stratigraphic resolution

Environment/lithology: fluvial; mudstone

Size class: macrofossils

Collected by Rebecca Schaff (MOR) in 2006

Primary reference: D. W. Fowler, J. P. Wilson, E. A. Freedman Fowler, C. R. Noto, D. Anduza and J. R. Horner. 2020. Trierarchuncus prairiensis gen. et sp. nov., the last alvarezsaurid: Hell Creek Formation (uppermost Maastrichtian), Montana. Cretaceous Research 116:104560 [P. Mannion/P. Mannion]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 217033: authorized by Philip Mannion, entered by Philip Mannion on 19.01.2021

Creative Commons license: CC BY (attribution)