Changes in nannofossil morphology by diagenetic processes in cretaceous chalk deposits

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Abstract
Nannofossil assemblages extracted from Hauterivian, Albian, Cenomanian, and Turonian chalks and marls have been structurally analysed using the electron microscope. In these assemblages several apparently different nannofossil forms can be identified as different stages in a diagenetic alteration of a known species. These different forms are illustrated and some paleontological notes on their structure given. Some of the dissolution forms have previously been described as separate species. These incorrectly separated forms are therefore placed in the appropriate synonymies.

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