Wikimedi'Òc

Procamelus mummy.JPG - Cropbot

Johnson 1920 HighPlains.jpg - Leaflet

Blanco Canyon Crosby County Texas.jpg - Leaflet

Panorama of the Palo Duro Canyon from the Park road down into the canyon.jpeg - Akarshsimha~commonswiki

Teleoceras sp. (fossil rhinoceros) Miocene near Ainsworth, Nebraska.jpg - Tillman

Ogallala, Algal Limestone bed, sample, Ellis County, Kansas 20200614 154704.jpg - IveGoneAway

Ogallala opaline sandstone with weathered silcrete 20201115 195900.jpg - IveGoneAway

Ogallala opaline sandstone with Cremnoceramus deformis fragments 20201115 143032.jpg - IveGoneAway

Scotts Bluff national Monument stratigraphic column.jpg - Pi3.124