This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1850 Excerpt: ...are now found scattered over tbe surface of Salisbury Plains. They are certainly scarce, but I have found a few in the valleys, although generally there hidden by the drift. Their very scarcity has, however, probably hastened the destruction of the few that have existed, and have been used for various economical ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1850 Excerpt: ...are now found scattered over tbe surface of Salisbury Plains. They are certainly scarce, but I have found a few in the valleys, although generally there hidden by the drift. Their very scarcity has, however, probably hastened the destruction of the few that have existed, and have been used for various economical purposes. t At least the only exception is the occasional bed of tbe Ostrea Bellovacina and shark's teeth at the base of this series, but the concretionary masses and the white sands occur more in the body of the strata. Still, traces of these fossils may possibly be found in some of the blocks around Newbury, or in some of the Hertfordshire pudding-stones; but hitherto no such impressions have, I believe, been met with. They are common also in the flint-gravel of the valleys of the district. That is to say, in the district westward of London. The fine-grained hard concretionary stone, before mentioned (p. 103) as occurring in the Woolwich series beneath or near London (Charlton), sometimes presents however a very similar appearance and fracture. of concretionary sandstones in the sections and cuttings of the Lower Tertiaries. In the Bagshot Sands themselves they are confined to a comparatively small range of country, and even in that district I have never seen them in sand-pits or road-side cuttings. They are sought out specially at a few spots on the hills by dipping iron rods into the sands. Again, although at and near London the Lower Tertiaries so often contain subordinate concretionary or conglomerate rocks, how rarely do such masses show at their outcrop: at Sundridge only are some of these latter beds worked. The flint-gravel which caps the hills around Newbury contains a few rather large specimens of the harder sandstones, but the gr...
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