ammonites
Liscomb Quarry (TMM/UAM) (Cretaceous to of the United States)

Where: North Slope County, Alaska (70.1° N, 151.6° W: paleocoordinates 83.8° N, 116.1° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Kogosukruk Tongue Member (Prince Creek Formation), Late/Upper Campanian to Late/Upper Campanian (83.5 - 65.5 Ma)

• local section dated as 68-71 Ma, mean 69 Ma

• bed-level stratigraphic resolution

Environment/lithology: crevasse splay; poorly lithified, brown, argillaceous sandstone and poorly lithified, pebbly, brown, sandy siltstone

• "frequent seasonal floods that were part of a complex fluvial system. Floods breached levees forming splays that often resulted in ephemeral ponds and marshy wet soils bearing lush vegetation." "Deposition occurred in trunk channels, on distributary-channel splay complexes, in interdistributary bays, and on floodplains."
• "matrix still adhering to the bones is a soft, brown, sandy silt" - also described as an "argillaceous sandstone"

Size classes: macrofossils, mesofossils

Collected by R. L. Liscomb, R. Gangloff, A. R. Fiorillo in 1961-2007; reposited in the TMM

Collection methods: quarrying, surface (float), mechanical,

• original discovery by R. L. Liscomb while working for Shell Oil Company, identified by C. Repenning (USGS) and sent to TMM; subsequent work by Univ. of Alaska Museum

Primary reference: K. L. Davies. 1987. Duck-bill dinosaurs (Hadrosauridae, Ornithischia) from the North Slope of Alaska. Journal of Paleontology 61(1):198-200 [M. Carrano/M. Carrano] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 51890: authorized by Matt Carrano, entered by Matt Carrano on 29.06.2005