Forest physiography; physiography of the United States and principles of soils in relation to forestry . 5 I 2 3 i 5 6 7 8 9 10SCALE IN MILES, HORIZONTAL AND VERTICAL CROSS SECTION CENTBAL CONNECTICUT IN THE CRETACEOUS PERIODC. Appearance of the surface at the end of the Jurassic-Cretaceous cycle of erosion. BY JOSEPH BARRELL Wes-tern Upland £SMs. ^.2^..^^ Mmj^^ l^Bh. .cSb Eastern Uprtand. I TYLassic intrusive granite-gneissesPaleozoic complex gneisses 3 4 5 6 7 8 9 10 BY JOSEPH BARRELL. S^ALE IN MILES^ HORIZONTAL AND VERTICAL CROSS SECTION CONJS^ECT
Forest physiography; physiography of the United States and principles of soils in relation to forestry . 5 I 2 3 i 5 6 7 8 9 10SCALE IN MILES, HORIZONTAL AND VERTICAL CROSS SECTION CENTBAL CONNECTICUT IN THE CRETACEOUS PERIODC. Appearance of the surface at the end of the Jurassic-Cretaceous cycle of erosion. BY JOSEPH BARRELL Wes-tern Upland £SMs. ^.2^..^^ Mmj^^ l^Bh. .cSb Eastern Uprtand. I TYLassic intrusive granite-gneissesPaleozoic complex gneisses 3 4 5 6 7 8 9 10 BY JOSEPH BARRELL. S^ALE IN MILES^ HORIZONTAL AND VERTICAL CROSS SECTION CONJS^ECTICUT VALLEY IN CENTRAL C0NNECTICT7T PRESENT GEOLOGIC TIME D. Following uplift there was more vigorous dissection of the softer sandstones, leaving the trap ridgesand crystalline uplands in relief. from 300 to 1000 feet thick. Then comes the thickest and main trapsheet, 400 to 500 feet thick, another series of shales 1200 feet thick, andan uppermost or posterior trap sheet 100 to 150 feet thick. Originally the sediments were deposited in a nearly horizontal posi-tion, and had this position been maintained up to the present, the topog-raphy and drainage of the region would be far more simple than is thecase to-day. It was while the sandstones were being deposited that thelava flows of the eastern trap sheets took place, and after they had beendeposited that the igneous intrusions of
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
