Monument Rocks (Kansas)
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Monument Rocks are a series of large chalk formations in Gove County, Kansas, rich in fossils. The formations were the first landmark in Kansas chosen by the U.S. Department of the Interior as a Natio
View of the Monument Rocks
Wide view of largest formation and arch
Southernmost rock in the early 1890s
Wide view from the west
Western Interior Seaway
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The Western Interior Seaway was a large inland sea that existed roughly over the present-day Great Plains of North America, splitting the continent into two major landmasses, Laramidia to the west and
Monument Rocks (Kansas)
…70 ft (21 m) and include formations such as buttes and arches. The carbonate deposits were laid down during the Cretaceous Period in what was then the Western Interior Seaway, which split the continent of North America into two landmasses. They are estimated to have been formed 80 million years ago. On January 29, 2008…
A broken concretion with fossils inside; late Cretaceous Pierre Shale near Ekalaka, Montana.
Artist's impression of a Cretoxyrhina and two Squalicorax circling a dead Claosaurus in the Western Interior Seaway
Inoceramus, an ancient bivalve from the Cretaceous of South Dakota.