Also known as Doaks Butte ash bed, KJ9733

Where: Bowman County, North Dakota (45.9° N, 103.9° W: paleocoordinates 52.2° N, 77.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: HCIa zone, Hell Creek Formation, Lancian (70.6 - 66.0 Ma)

• -75m to Hell Creek-Fort Union contact datum, -75m to K-T boundary based on calculations in Johnson (2002)

• bed-level stratigraphic resolution

Environment/lithology: wet floodplain; poorly lithified, tuffaceous 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 48250: authorized by Kirk Johnson, entered by Kirk Johnson on 15.03.2005

Creative Commons license: CC BY (attribution)