File:The Quarterly journal of the Geological Society of London (1877) (14743682606).jpg

Identifier: quarterlyjourna331877geol (find matches)
Title: The Quarterly journal of the Geological Society of London
Year: 1845 (1840s)
Authors: Geological Society of London
Subjects: Geology
Publisher: London (etc.)
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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hole question turns on the age of the clay above thebone-bearing strata at and within the entrance. And this is notproved to be boulder-clay ( Ice Age, p. 510), because there areno boulders in it; nor is it proved to be Glacial ( Nature, 1876,p. 505), because clay of that kind is now being deposited in thatvery cave. That it has ultimately been derived from the wreck ofthe Boulder-clay at a higher level, which was formerly spread overthe country, and has been washed in by the rains, is very probable.Nor do the piles of travelled blocks which occur in the talus out-side the entrance throw any light on the point, because they arerernanies and not in situ. They may have tumbled from the cliffsabove during the accumulation of the talus, and long after theglaciers had retired from Yorkshire. These doubts as to the pre-or interglacial age of the fauna below the clay which grew up in mymind while intrusted with the conduct of the exploration, and have 608 W. BOYD DAWKINS ON TIIE MAMMAL-FAUNA
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W5 ^ -^_ been confirmed since by repeated visits, are shared by Prof. Hughes,whose opinions on a matter of this kind are entitled to the greatestweight. At present he holds that it is postglacial. The second reputed case of the discovery of Pleistocene mamma-lia in Glacial or Interglacial deposits is offered by those in the cavesof Cefn explored and described by Dr. Falconer, Mrs. AYilliamWynn, Prof. Hughes, the Rev. D. R, Thomas, and myself, and latelycorrelated (Quart. Journ. Geol. Soc. xxxii. p. 94) by Mx. Mackin-tosh with the Glacial strata of the surrounding district. Here, OF THE CAVES OF CRESWELL CRAGS. 609 again, the value of the evidence turns on the point as to whetherthe strata inside the caves are Glacial deposits in situ or have beenderived from their denudation. Both Prof. Hughes and myselfagree in holding the latter view. This may have happened at anyperiod in the Pleistocene age subsequent to their deposition, by thewaves of the sea. It seems therefore to me altogether

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