Niobrara Chalk

Interbedded, soft, light-gray calcareous shale and chalk
State Kansas
Name Niobrara Chalk
Geologic age Late Cretaceous
Lithologic constituents
Major
Sedimentary > Carbonate > Limestone (Bed)
Sedimentary > Clastic > Mudstone > Shale (Bed)
Comments formerly Niobrara FM. approximate thickness 600 ft. in outcrop.
References

Ross, Jorgina A., 1991, Geologic Map of Kansas: Kansas Geological Survey, Univ. of Kansas, Map M-23, scale 1:500,000.

Zeller, D.E., ed., 1968, The Stratigraphic Succession in Kansas, State Geological Survey of Kansas Bull. 189.

NGMDB product
Counties Ellis - Finney - Gove - Graham - Hamilton - Hodgeman - Jewell - Lane - Logan - Mitchell - Ness - Norton - Osborne - Phillips - Rooks - Rush - Russell - Scott - Smith - Trego - Wallace