Page:Quarterly Journal of the Geological Society of London, vol. 27.djvu/556

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 * height=140px | Cefn No. 1.
 * | Cefn No. 2.
 * | Galtfaenan.
 * | Plas Heaton.
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From this list all reference to the series of prehistoric mammalia, and to the traces of prehistoric man, has been omitted.

Mr. indicated the exact position in which the jaw of the Glutton was found, but pointed out that, owing to the excavations of keepers, Badgers, Rabbits, &c, the earth was so much disturbed in that part that it was impossible to be sure of the original relative position of the bones. He showed that the Plas Heaton Cave was on a hill rising from the top of the plateau, while the Cefn, Brysgill, and Galtfaenan Caves were in the gorge cut through that plateau, and therefore that the Plas Heaton Cave was probably formed, and might possibly have been first occupied, at a much earlier period than the others. As it appeared to pass under that part of the hill which is overlapped by heavy drift, he thought it quite possible that this may have been a preglacial cave, and that by-and-by we may find evidence of a preglacial fauna in it.

The Rev. mentioned that in some of the pot-holes in the roof of the Cefn cave he had procured silt containing remains of shells determined by Mr. Jeffreys to be marine.

Mr. explained that these shells had probably been washed in from the superficial marine drift of the district.

Mr., in reply, expressed his belief that though the excavation of the caves in question might have taken place at different periods, yet that their occupation was, geologically speaking, contemporaneous.