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Heterohelicids from the Turonian of Senegal (West Africa) with Particular Emphasis on Heterohelix americana (Ehrenberg)

Ivan de Klasz, Sandrine de Klasz and Pierre Saint-Marc
Micropaleontology
Vol. 41, No. 4 (Winter, 1995), pp. 359-368
DOI: 10.2307/1485809
Stable URL: http://www.jstor.org/stable/1485809
Page Count: 10
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Heterohelicids from the Turonian of Senegal (West Africa) with Particular Emphasis on Heterohelix americana (Ehrenberg)
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Abstract

The foraminiferan Heterohelix americana, first described in the Upper Cretaceous of the United States by Ehrenberg in 1843, was designated by Cushman (1927a) as the genotype of Heterohelix Ehrenberg. We have found, for the first time in Africa, a form close to this rare species in samples from Rd2 borehole of Western Senegal, together with a large number of other heterohelicids and hedbergbellids of probable early Turonian age. Specimens of Heterohelix americana and some accompanying planktonic forms are figured, and some of them discussed where this is warranted by differences or even contradictions in the literature.

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