Also known as Jack

Where: Slope County, North Dakota (46.4° N, 103.9° W: paleocoordinates 52.2° N, 79.0° W)

• coordinate stated in text

• small collection-level geographic resolution

When: FUI zone, Ludlow Member (Fort Union Formation), Puercan (66.0 - 63.3 Ma)

• 40m to Hell Creek-Fort Union contact datum, 37.405m to K-T boundary based on calculations in Johnson (2002)

• bed-level stratigraphic resolution

Environment/lithology: pond; poorly lithified mudstone

Size class: macrofossils

Preservation: adpression

Reposited in the DMNH

Collection methods: quarrying, mechanical,

• Specimens located at Denver Museum of Nature & Science

Primary reference: K. R. Johnson. 2002. Megaflora of the Hell Creek and lower Fort Union Formations in the western Dakotas: Vegetational response to climate change, the Cretaceous-Tertiary boundary event, and rapid marine transgression. The Hell Creek Formation and the Cretaceous-Tertiary boundary in the northern Great Plains: An integrated continental record of the end of the Cretaceous. 361:329-391 [S. Wing/S. Wing/K. Johnson]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 25004: authorized by Kirk Johnson, entered by Michele Reynolds on 24.08.2002

Creative Commons license: CC BY (attribution)