Abstract
The stratigraphic and sedimentological study of two sections in the Agadir (High Atlas) and Boulmane (Middle Atlas, Morocco) regions, and the examination of ostracod associations reveal the palaeoenvironments at the Cenomanian-Turonian boundary and specify the influence of different environmental factors on ostracod populations. Ostracod polymorphism appears to reflect adaptative strategies in response to environmental modifications. Cladogenetic and anagenetic polymorphism developed within Oertliella? tarfayaensis and Veenia (Nigeria) rotunda species respectively.
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