County: Logan

Date: June 1969

Photographer: Grace Muilenburg/KGS

Place Name:

Short description: Volcanic ash over Niobrara Chalk in Logan County. The Cretaceous-age Niobrara Chalk in western Kansas was deposited in a massive inland sea that ran north to south across west-central North America about 80 million years ago.

Hi-Resolution Version

Credit: This photo may be reproduced for non-commercial and educational purposes. When using this photo in a publication, website, or presentation, please credit Kansas Geological Survey. For information about use for commercial purposes, please contact the KGS editor.