. Bulletin of the Philosophical Society. Philosophical Society (University of Virginia). Scientific Section; Science; Philosophy. GEOLOGY OF GRAVES MOUNTAIN 203 Physiography. The immediate country in the vicinity of Graves Moun- tain averages about 550 feet above tide. It has gently inclined but broadly undulating surfaces so characteristic of the inner eastern margin of the Piedmont province. The larger streams have carved deep valleys below the plateau surface. Graves Mountam is a conspicuous ridge (monadnock) of unreduced hard rock, which rises to an altitude of 700 feet above tide level, a
. Bulletin of the Philosophical Society. Philosophical Society (University of Virginia). Scientific Section; Science; Philosophy. GEOLOGY OF GRAVES MOUNTAIN 203 Physiography. The immediate country in the vicinity of Graves Moun- tain averages about 550 feet above tide. It has gently inclined but broadly undulating surfaces so characteristic of the inner eastern margin of the Piedmont province. The larger streams have carved deep valleys below the plateau surface. Graves Mountam is a conspicuous ridge (monadnock) of unreduced hard rock, which rises to an altitude of 700 feet above tide level, and several hundred feet above the Piedmont Tertiary base-leveled plain. It is the highest point of land between it and the ocean. It is removed from the major lines of drainage, which fact together with structure and lithologic character of the rock of which it is composed, are the chief factors responsi- ble for its existence. A number of similar low ridges, locally called moun-. FiG. 2. View op Grates Mountain, Georgia, looking Southeast. J. H. Watkins, erom photograph.) (Sketch bt tains, stand up above the general level of the plateau surface over parts of Lincoln County, but none of these are found in the immediate vicinity of Graves Mountain. The ridge, locally known as Graves Mountain, has a length of two miles along an approximate northeast-southwest direction, coincident with the general structure of the rocks of the area, is less than a half mile in average width, and rises several hundred (300?) feet above the surface of the sur- rounding plain. The slopes of the mountain are very unequal. They are less steep on the northwest side which is the direction of dip than on the southeast side. They are steeper near the top of the ridge but become more gradual about half the distance down until merged with the plateau sur- face at the base. The upper portion of the ridge is greatly scarred and roughened from weathering and low and high cliffs are numerous. Fig. 2. a pen sket
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