. The Quarterly journal of the Geological Society of London. aldon is so striking,that I feel sure that both flint and chert are derived, not directlyfrom Cretaceous rocks, but through the intermediary of someEocene river-gravel, such as was described iu the two papersalready published. So far as we know, there is no reason to suppose that any Eoceneoutlier still exists in the county; but the curious localization of an i t Natural History of Cornwall folio, 1753, p. 106. Vol. 60.] EOCENE OUTLIER OEE THE CORXTSH COAST. 115 extensive deposit of angular Chalk-flints at Ludgvan. and theoccurrence
. The Quarterly journal of the Geological Society of London. aldon is so striking,that I feel sure that both flint and chert are derived, not directlyfrom Cretaceous rocks, but through the intermediary of someEocene river-gravel, such as was described iu the two papersalready published. So far as we know, there is no reason to suppose that any Eoceneoutlier still exists in the county; but the curious localization of an i t Natural History of Cornwall folio, 1753, p. 106. Vol. 60.] EOCENE OUTLIER OEE THE CORXTSH COAST. 115 extensive deposit of angular Chalk-flints at Ludgvan. and theoccurrence of a mass of beach-pebbles of the same flints to the lee-ward at Mullion, convince me that an Eocene outlier is preserved,or lately existed, under the sea not far from St. Michaels stones from this deposit were probably thrown up by stormsand carried up entangled in seaweed, uutil they formed a considerablepart of the raised beach opposite. They were also drifted by the Fig. 1.—Map of South-Western Cornwall, on tlu scale of 6 miles to the Above 400 Feet m Below 200 Feet, fr WolfRcclc prevalent wind right across Mounts Bay, becoming smaller andmore rounded, till they were reduced to the smooth bean-like pebbleswhich we find at Gunwalloe. The curious distribution of the flints, which elsewhere in Corn-wall seem to occur only as scattered ice-borne erratics, combineswith the striking contour of the bay (see fig. 1) in which theangular flints occur to localize the outlier; but there is a furtherpiece of evidence, of which the bearing was not at first seen. 12 be -v i^o-i-,. l^> I, U fc: 20 05 SiSO <3 I CM*bb 5 Is o
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
