. Baltimore county. Geology; Mines and mineral resources; Physical geography; Forests and forestry. 184 Crystalline Rocks of Baltimore County Berkey has recently described the pre-Cambrian section in the vicinity of New York City as follows:30 Manhattan schist In wood limestone Lowerre quartzite Fordham gneiss Structure Streams, during their erosion of an upland area, carry in their chan- nels a large quantity of detrital material that eventually finds a resting. Fig. 13.—Diagram of Upright Folds (above) and Overturned Folds (below) place either upon land or in the sea. Sediments thus deposite
. Baltimore county. Geology; Mines and mineral resources; Physical geography; Forests and forestry. 184 Crystalline Rocks of Baltimore County Berkey has recently described the pre-Cambrian section in the vicinity of New York City as follows:30 Manhattan schist In wood limestone Lowerre quartzite Fordham gneiss Structure Streams, during their erosion of an upland area, carry in their chan- nels a large quantity of detrital material that eventually finds a resting. Fig. 13.—Diagram of Upright Folds (above) and Overturned Folds (below) place either upon land or in the sea. Sediments thus deposited from running water have a nearly horizontal position, a fact which can be readily verified by any observer who studies the silt deposited by a small tributary where it enters a large stream. When these fiat-lying sedi- ments are buried under a load of deposits they are indurated and consolidated into rocks. These rocks may be brought to the surface- by an uplift of certain portions of the earth's crust. If such an uplift is 10 Berkey, C. P., Geology of the West Point quadrangle, New York State Mus Bull. Xos. 225, 226, p. 40, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Maryland Geological Survey; Berry, Edward Wilber, 1875-1945; Knopf, Eleanora Frances Bliss, 1883-; Jonas, Anna I. (Anna Isabel), 1881-; Mathews, Edward Bennett, 1869-; Watson, Edward Hahn, 1902-; Carter, William T. (William Thomas), 1877-; Snyder, Joseph M. , 1889-; Bruce, Oscar Clayton, 1891-; Nunn, Roscoe; Bauer, L. A. (Louis Agricola), 1865-1932; Besley, F. W. (Fred Wilson), 1872-1960. Baltimore, The Johns Hopkins press
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