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Namurian Radiolaria of the Genus Ceratoikiscum from Staffordshire and Derbyshire, England

B. K. Holdsworth
Micropaleontology
Vol. 15, No. 2 (Apr., 1969), pp. 221-229
DOI: 10.2307/1484921
Stable URL: http://www.jstor.org/stable/1484921
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Namurian Radiolaria of the Genus Ceratoikiscum from Staffordshire and Derbyshire, England
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Abstract

The diagnosis of the radiolarian suborder Albaillellaria is emended, and a new family, the Ceratoikiscidae, is erected. Four new species of Ceratoikiscum are described from calcareous concretions in Carboniferous (Namurian) goniatite bands of Staffordshire and Derbyshire, England. These species differ considerably from Devonian forms of the genus, and there is a suggestion of a minor change in the Ceratoikiscum species within the Arnsbergian (E2) Stage of the Namurian.

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