Siluro-Devonian thelodonts from the Welsh Borderland
- 1 November 1973
- journal article
- Published by Geological Society of London in Journal of the Geological Society
- Vol. 129 (6) , 557-582
- https://doi.org/10.1144/gsjgs.129.6.0557
Abstract
Silurian, Downtonian and Dittonian strata from the Welsh Borderland contain a succession of thelodonts (Agnatha). Isolated scales have been identified and a new species, Apalolepis toombsi, is described. Four scale assemblages are recognized: Turinia pagei in Dittonian; Goniporus/Katoporus in U. Red Downton Group; Acanthodians (thelodonts absent) in Holdgate Sandstones Group and Thelodus parvidens in the Silurian—Lower Red Downton Group. The Thelodus parvidens assemblage occurs above and below the Ludlow Bone Bed, which, on the basis of the thelodonts, does not correspond to a major break in the succession. The incoming of the Turinia pagei assemblage at the beginning of the Dittonian marks a principal faunal change, and this can be correlated with the N. German Beyrichienkalk erratics, and the Polish-Lithuanian and Spitsbergen sequences. Comparison of the Welsh Borderland thelodont succession with that of Scotland, Europe, Russia and Canada suggests the existence of distinct faunal provinces, influenced by palaeogeography.This publication has 36 references indexed in Scilit:
- A correlation of Silurian rocks in the British IslesJournal of the Geological Society, 1971
- Timing of the Appalachian/Caledonian Orogen ContractionNature, 1970
- Evolution of the Appalachian/Caledonian OrogenNature, 1969
- Vertebrate faunas and correlation of the Ludlovian-Lower Devonian in eastern EuropeJournal of the Linnean Society of London, Zoology, 1967
- The fit of the continents around the AtlanticPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1965
- THE DEVONIAN STRATIGRAPHY OF NORTH AND CENTRAL VESTSPITSBERGENProceedings of the Yorkshire Geological and Polytechnic Society, 1961
- A Revised Classification of the Ludlovian Succession at LudlowNature, 1959
- XIII.—A New Cephalaspid Fish from the Downtonian of Scotland, with Notes on the Structure and Classification of OstracodermsTransactions of the Royal Society of Edinburgh, 1947
- XXXII.—Report on Fossil Fishes collected by the Geological Survey of Scotland in the Silurian Rocks of the South of ScotlandTransactions of the Royal Society of Edinburgh, 1900
- XX.—On a New Species of Cephalaspis, discovered by the Geological Survey of Scotland, in the Old Red Sandstone of ObanTransactions of the Royal Society of Edinburgh, 1900