KGS Cyclic Sedimentation Original published in D.F. Merriam, ed., 1964, Symposium on cyclic sedimentation: Kansas Geological Survey, Bulletin 169, pp. 1-20

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Figure 2--Thin section of Florissant lake deposits showing graded tuff and diatomite-sapropel laminae. Diatomite-sapropel unit is missing in third graded layer from top (X 20).

black and white photo of thin section

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Kansas Geological Survey
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Web version April 2003. Original publication date Dec. 1964.