The Quarterly journal of the Geological Society of London . e district. If the boringsin the limestone forming the face of the cliff in which the openingsinto Kents Hole Cavern occur, at a height of 180 feet above the sea,have been made by a marine animal (Pholas, or any other borer)then it is good evidence that the drift has been removed from thenarrow and short valley below the cave, leaving no marks of denu-dation on the valley itself. We have therefore no evidence in Kents ?^ I may add that the fringes of gravel along the Devonshire valleys werenoticed by Mr. Grodwin-Austen in an early pap
The Quarterly journal of the Geological Society of London . e district. If the boringsin the limestone forming the face of the cliff in which the openingsinto Kents Hole Cavern occur, at a height of 180 feet above the sea,have been made by a marine animal (Pholas, or any other borer)then it is good evidence that the drift has been removed from thenarrow and short valley below the cave, leaving no marks of denu-dation on the valley itself. We have therefore no evidence in Kents ?^ I may add that the fringes of gravel along the Devonshire valleys werenoticed by Mr. Grodwin-Austen in an early Denudation of Rocks in Devonshire, 1864, p. 19. 466 PROCEEDOfGS OF THE GEOLOGICAL SOCIETY. [Apr. 25^ Hole valley of such, a great denudation as Mr. Prestwich supposesto have occurred in the valley of the Somme, although we have inboth places drift associated with the bones of extinct Mammalia,and with rude flint implements at very high levels above the sea. Fig. 1.—Longitudinal Section of Mary church Valley. 3soft «yoft. * Pholas markings. The raised beaches fringing the coast-line in the south-east ofEngland, north-east of Prance, and south-east of Devonshire, aswell as the gravels, &c., fronting at similar heights the transversevalleys wMch open in both districts into the English Channel, placeall these localities in close geological relationship. The presence of calcareous deposits on the sides of tlie chalk val-leys in Erance, described by Mr. Prestwich, is matched in Devonshireby a calcareous deposit which has cemented loose blocks of limestoneon the solid rock. At Watcombe, &3, one mile nortli-east of Kents Hole Cavern,the analogy is still more complete, if I am correct in the suggestionthat this may be a thick bed of freshwater loess covering the angu-lar drift below it, and that both drift and loess are derived from theruins of the Triassic rocks close by. The clay in question is ex-tremely fine, and must have been deposited from
Size: 3351px × 746px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
