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Geologic History of Kansas

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Figure 19

Figure 19--Isopachus map of Niobrara Formation in Kansas. Contour interval 50 feet.

Niobrara limited to same counites as Pierre in subsurface; outcrop belt 
extends from NW corner to line of counties that goes from Greeley to Ness 
to Jewell.

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Kansas Geological Survey, Geologic History of Kansas
Comments to
Web version April 2006. Original publication date Dec. 1963.