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IV.—On the Relation of the Glacial Drift to the Raised Beach near Porth Clais, St. Davids

Published online by Cambridge University Press:  01 May 2009

Arthur L. Leach
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Extract

1. The raised beach near Porth Clais consists of shingle and large wave-worn boulders resting on a rock-platform, and overlain by angular head or rubble of local rocks.

2. Glacial drift (Boulder-clay) overlies the head at the western end of the section, and towards the east has ploughed into the raised beach and rests on the solid rock. Some of the boulders of the raised beach and a small piece of the rock-platform are definitely striated under the Glacial drift.

3. The raised beach is pre-Glacial in the sense that it underlies the Glacial deposit.

4. The raised beach contains non-local boulders which may have been transported by drifting shore-ice.

Type
Original Articles
Information
Geological Magazine , Volume 8 , Issue 10 , October 1911 , pp. 462 - 466
Copyright
Copyright © Cambridge University Press 1911

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References

page 462 note 2 Geol. Mag., Dec. IV, Vol. VII, 1900, p. 441Google Scholar.

page 462 note 3 The Country around Swansea (Mem. Geol. Surv., 1907)Google Scholar.

page 463 note 1 See Geology in the Field, 1910, pp. 851–2Google Scholar.

page 463 note 2 Summary of Progress for 1905 (Mem. Geol. Surv.), p. 70Google Scholar.

page 463 note 3 Dixon, E. L., Summary of Progress for 1906 (Mem. Geol. Surv.), p. 63Google Scholar.

page 463 note 4 Quart. Journ. Geol. Soc, vol. xlviii, 1902, p. 293Google Scholar.

page 465 note 1 The soil has been replaced upon the glaciated surface and covered by a large slab of rock. The point * is 20 yards west of the large angular boulder indicated in the diagram.

page 465 note 2 See MrTiddeman's, R. H. figure reproduced in Geology in the Field, p. 852Google Scholar.

page 466 note 1 Fielden, Colonel H. W., Quart. Journ. Geol. Soc., vol. xxxiv, p. 556, 1878Google Scholar.