Chemical analysis of foraminifera, tiny organisms that require a microscope to see and identify, will provide an age estimate of the sediment layers.
Foraminifera
Image courtesy of Globorotalia menardii; Brady, H.B. (1884) Report on the Foraminifera dredged by H.M.S. Challenger during the Years 1873-1876. Pl. 103 Download larger version (jpg, 123 KB).

Chemical analysis of foraminifera, tiny organisms that require a microscope to see and identify, will provide an age estimate of the sediment layers.

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