Forest physiography; physiography of the United States and principles of soils in relation to forestry . changes its char-acter completely. In western Virginia and in its northern extensionsin Maryland and south-central Pennsylvania it is a true ridge, but itstopographic aspects are gentle and it is characterized by rounded spursand knobs. It is soil covered throughout and bears forests, or culti-vated fields, or pastures, up to the summit. OLDER APPALACHIANS (SOUTHERN DIVISION) 621 The highest portion of the Blue Ridge north of North Carolina is about 05 miles south ofthe Potomac, where Stony
Forest physiography; physiography of the United States and principles of soils in relation to forestry . changes its char-acter completely. In western Virginia and in its northern extensionsin Maryland and south-central Pennsylvania it is a true ridge, but itstopographic aspects are gentle and it is characterized by rounded spursand knobs. It is soil covered throughout and bears forests, or culti-vated fields, or pastures, up to the summit. OLDER APPALACHIANS (SOUTHERN DIVISION) 621 The highest portion of the Blue Ridge north of North Carolina is about 05 miles south ofthe Potomac, where Stony Man and Hawks Bill opposite Luray are 4031 and 4066 feet re-spectively above sea level. This is also the widest portion of the Blue Ridge, 10 to 16 the ridge crests are lower, and from Mount Marshall to the Potomac (50 miles) thereare three deep gaps cut down to about 1000 feet — Snickers, .Vshby, and Manassas gaps. South-ward from Mount Marshall (3150 feet) 100 miles to the James there are numerous smaller gaps,but they are all at higher elevations, about 2300 feet above the Fig. 252. — Blue Ridge, Catoctin Mountain and Bull Run Mountain in Virginia. Blank areas representTertiary peneplain; shaded areas represent remnants of Cretaceous peneplain now appearing asresiduals above the Tertiary level. (Keith, U. S. Geol. Surv.) 62 2 FOREST PHYSIOGRAPHY The Blue Ridge extends northwardfrom the Potomac still as a quartz-ite ridge of rounded contour knownas Catoctin Mountain in Marylandand finally into south-central Penn-sylvania near Carlisle, where it isknown as South Mountain, reachingan elevation of 2000 feet, or about1000 to 1200 feet above the Cum-berland Valley which here borders iton the west. In New Jersey theBlue Ridge is represented by thehighlands above Morristown, andthe Highlands of the Hudson arereally the northward continuationand expansion of the Blue latter form a narrow uplandbelt 1200 feet high and 12 miles widethat crosses the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
