. Baltimore county. Geology; Mines and mineral resources; Physical geography; Forests and forestry. 60 The Physiography of Baltimore County cuts. The Coastal Plain formations overlie the hard rocks of the Piedmont Province with a gentle inclination towards the southeast, so that in the extreme southeastern part of Baltimore County, near Sparrows Point, the base of the Coastal Plain is more than 600 feet below sea level. A large part of the city of Baltimore south of Xorth Avenue is covered by Cretaceous and Pleistocene gravel, sand, and clay under which the hard rock basement appears in the va
. Baltimore county. Geology; Mines and mineral resources; Physical geography; Forests and forestry. 60 The Physiography of Baltimore County cuts. The Coastal Plain formations overlie the hard rocks of the Piedmont Province with a gentle inclination towards the southeast, so that in the extreme southeastern part of Baltimore County, near Sparrows Point, the base of the Coastal Plain is more than 600 feet below sea level. A large part of the city of Baltimore south of Xorth Avenue is covered by Cretaceous and Pleistocene gravel, sand, and clay under which the hard rock basement appears in the valleys of Jones Falls and Gwynns Falls where the streams have removed the unconsolidated cover and cut into the hard rock Fig. 6.—Map showing the physiographic provinces of Maryland and their subdivisions. In that part of the channels where the streams have cut down into the basement rock they flow over falls and rapids in turbulent courses, but where the channels are cut in the Coastal Plain deposits they flow quietly seaward along a gentle and uniform gradient. The prevalence of falls in the rocky channels has led to the use of the term "fall-line" to denote the boundary between the Coastal Plain and the Piedmont Province. "Fall-line," however, is a somewhat misleading expression for two reasons. In the first place the boundary between the two provinces is not a sharp line but is rather a zone of considerable width. 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.
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