KGS Cyclic Sedimentation Original published in D.F. Merriam, ed., 1964, Symposium on cyclic sedimentation: Kansas Geological Survey, Bulletin 169, pp. 541-563

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Figure 10--Concretions from Protocardia-Oxytoma and Idonearca Assemblage Zones. A, Fragment with Protocardia. B, Fragment with Oxytoma. C, Part of a Idonearca concretion.

black and white photo of three concretions

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Kansas Geological Survey
Comments to
Web version March 2003. Original publication date Dec. 1964.