Page:Geological Evidences of the Antiquity of Man.djvu/238

220 loose sand, loam, and pebbles, are so complicated that not only may we sometimes find portions of them which maintain

their verticality to a height of ten or fifteen feet, but they have also been folded upon themselves in such a manner that continuous layers might be thrice pierced in one perpendicular boring.

At some points there is an apparent folding of the beds round a central nucleus, as at a, fig. 30, where the strata seem

bent round a small mass of chalk, or, as in fig. 31, where the blue clay, No. 1, is in the centre; and where the other strata, 2, 3, 4, 5, are coiled round it; the entire mass being twenty