Where: Logan County, Kansas (38.8° N, 100.9° W: paleocoordinates 41.4° N, 67.1° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Niobrara Formation (Colorado Group), Coniacian to Coniacian (89.8 - 83.6 Ma)

• "Upper Cretaceous, Niobrara" according to Shufeldt 1915 (age assignment based on age of other Niobrara collections)

• bed-level stratigraphic resolution

Environment/lithology: yellow chalk

Size class: macrofossils

Collected by O. C. Marsh in 1872; reposited in the YPM

Primary reference: O. C. Marsh. 1873. Notice of a new Species of Ichthyornis . American Journal of Science and Arts 5(1):74 [J. Alroy/J. Alroy/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 85294: authorized by John Alroy, entered by John Alroy on 10.12.2008, edited by Evangelos Vlachos

Creative Commons license: CC BY (attribution)