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A Graptolite Lineage from North Cardiganshire

Published online by Cambridge University Press:  01 May 2009

John Challinor
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Extract

As the result of examining a considerable number of specimens belonging to the species Monograptus fimbriatus, M. raitzhainiensis, and M. triangulatus from certain strata of Llandovery age at a locality in North Cardiganshire, the writer is led to the conclusion that the forms comprised within these species constitute a continuously graded morphological series; and that the stratigraphical occurrence of these forms shows that this series is, further, an evolutionary lineage.

Type
Articles
Information
Geological Magazine , Volume 82 , Issue 3 , June 1945 , pp. 97 - 106
Copyright
Copyright © Cambridge University Press 1945

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References

List of Works Referred To

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Hills, E. S., and Thomas, D. E., 1944. Deformation of Graptolites and Sandstones in Slates from Victoria, Australia. Geol. Mag., lxxxi, 216.Google Scholar
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