Trace fossils of Fort Hays Limestone Member of Niobrara Chalk (Upper Cretaceous), west-central Kansas 

https://kuscholarworks.ku.edu/handle/1808/3828
Title: Trace fossils of Fort Hays Limestone Member of Niobrara Chalk (Upper Cretaceous), west-central Kansas 
Author(s):
Robert W. Frey
Paleo Publication Type:
KU Paleontological Contributions
Publication Format:
Journal article
Year of publication:
1970