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. 1888 Excerpt: ...Thus, if the base of the Chalk reached to what would now be a level of 900 feet over the edge of the Triassic boundary, and we suppose the water there to have been 600 feet deep, it would not have overtopped the Pennine hills, which even now rise in many places to heights of over 2,000 feet, and in the Cretaceous ...
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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. 1888 Excerpt: ...Thus, if the base of the Chalk reached to what would now be a level of 900 feet over the edge of the Triassic boundary, and we suppose the water there to have been 600 feet deep, it would not have overtopped the Pennine hills, which even now rise in many places to heights of over 2,000 feet, and in the Cretaceous period the watershed must have been much higher than it is now. Hence I do PLATE X. CRETACEOUS GEOGRAPHY (SHOWING THE PROBABLE COASTLINE DURING THE FORMATION OF THE UPPER GREENSAND). not think that this range was submerged till the time of the Middle or Upper Chalk. The remarkable change, however, which takes place in the character of the Red Chalk when followed along the northern face of the Yorkshire Wolds, and its partially argillaceous condition at Speeton (see p. 171), are facts which suggest that currents carrying fine silt came from a north-easterly direction, and that their influence was felt as far south as the north-east of Yorkshire. This consideration leads us to infer that continental land existed at some distance north and north-east of the present outcrop--a land which doubtless included Scotland and Scandinavia, and would effectually shut out the Arctic currents; it is at the same time quite possible that its highest mountains were snow-clad, and they may even have nourished glaciers which reached far down the valleys toward the shores of the great European Ocean. There would at length come a time when the barriers which limited the Greensand sea were breached and overtopped, when Wales was nearly isolated, and the hills of Devon and Cornwall converted into islands; the sea then spread to the north-west, over the areas of the older Mesozoic rocks, to the north of Ireland and the west coast of Scotland. The facts observed in connecti...
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