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IV.—Note on the ‘Lower Tremadoc’ Rocks of St. David's, Pembrokeshire1

Published online by Cambridge University Press:  01 May 2009

John Pringle
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Extract

In the year 1866 Hicks and Salter recorded the occurrence of certain rocks in the neighbourhood of St. David's which they regarded as Tremadoc deposits. The beds appeared to them to rest conformably on the Lingula Flags, but when the rocks were compared with those of the Tremadoc area striking lithological differences were noticed. Accompanying the report was a list of fossils collected from the beds, and the fauna was so wholly unlike that of the North Wales deposits that the authors were led to conclude that the dissimilarity was due to the conditions under which the strata were deposited.

Type
Original Articles
Information
Geological Magazine , Volume 8 , Issue 12 , December 1911 , pp. 556 - 559
Copyright
Copyright © Cambridge University Press 1911

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Footnotes

1

Communicated by permission of the Director of H.M. Geological Survey.

References

page 556 note 2 Hicks, & Salter, , Second Report on the Menevian Group and other formations at St. David's, Pembrokeshire: Rep. Brit. Assoc, Nottingham, 1866, p. 184.Google Scholar

page 556 note 3 Hicks, H., “On the Tremadoc Rocks in the neighbourhood of St. David's, South Wales, and their fossil contents”: Q.J.G.S., vol. xxix, p. 39, 1873.Google Scholar

page 556 note 4 Hicks, H., “On the Succession of the Ancient Rocks of St. David's”: Q.J.G.S., vol. xxxi, p. 167, 1875.Google Scholar

page 557 note 1 The line-drawing from which this illustration was prepared was kindly made by Mr. R. Ashborn.

page 557 note 2 Hicks, & Salter, , Second Report on the Menevian Group and other formations at St. David's, Pembrokeshire: Rep. Brit. Assoc, Nottingham, 1866, p. 184.Google Scholar

page 558 note 1 The Trilobites were kindly identified by Mr. Philip Lake.

page 558 note 2 Biles, Gertrude L., “Some Graptolite Zones in Arenig Rocks”: GEOL. MAG., 1904, p. 209.Google Scholar

page 558 note 3 Thomas, H. H., in the Geology of the South Wales Coal-field, pt. x (Mem. Geol. Surv.), 1909, p. 10.Google Scholar