Hostname: page-component-7b7567c8c-lpg2g Total loading time: 0 Render date: 2026-11-15T17:48:22.255Z Has data issue: false hasContentIssue false
  • English
  • Français

A Graptolite Lineage from North Cardiganshire

Published online by Cambridge University Press:  01 May 2009

John Challinor
Get accessRights & Permissions [Opens in a new window]

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.

Information

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

List of Works Referred To

Bulman, O. M. B., 1933. Programme-evolution in the Graptolites. Biol. Rev., viii, 311.CrossRefGoogle Scholar
Elles, G. L., 1922. The Graptolite Faunas of the British Isles. Proc. Geol. Assoc., xxxiii, 168.CrossRefGoogle Scholar
Elles, G. L. 1944. The Identification of Graptolites. Geol. Mag., lxxxi, 145.CrossRefGoogle Scholar
Elles, G. L. and Wood, E. M. R., 1912. A Monograph of British Graptolites. Part IX. Palaeont. Soc.Google Scholar
Hills, E. S., and Thomas, D. E., 1944. Deformation of Graptolites and Sandstones in Slates from Victoria, Australia. Geol. Mag., lxxxi, 216.Google Scholar
Jones, O. T., 1909. The Hartfell-Valentian Succession around Plynlimon and Pont Erwyd. Quart. Journ. Geol. Soc., lxv, 463.Google Scholar