Forest physiography; physiography of the United States and principles of soils in relation to forestry . opes and smooth contours. In the interstream areas of thesouthern counties of Maryland one may travel for miles and never crossa well-marked valley. Where forests grow they have still further re- C. Abbe, Jr., A General Report on the Physiography of Maryland, Including the Develop-ment of the Piedmont Plateau, Md. Weather Service, vol. i, pt. 2, p. 84. 5i8 FOREST PHYSIOGRAPHY tarded the run-off, so that wet swamps occur in the original inequalitiesof the surface. Signs of stream sculpture a
Forest physiography; physiography of the United States and principles of soils in relation to forestry . opes and smooth contours. In the interstream areas of thesouthern counties of Maryland one may travel for miles and never crossa well-marked valley. Where forests grow they have still further re- C. Abbe, Jr., A General Report on the Physiography of Maryland, Including the Develop-ment of the Piedmont Plateau, Md. Weather Service, vol. i, pt. 2, p. 84. 5i8 FOREST PHYSIOGRAPHY tarded the run-off, so that wet swamps occur in the original inequalitiesof the surface. Signs of stream sculpture are rare; the surface seems topreserve the outlines originally imposed by waves and currents. In con-trast to these streams are the tidal estuaries and the slow meanderingcreeks that cross the salt marshes and have low though steep banksdeeply fringed with reeds. Virginia-North Carolina Section The physiography of the third district of the Coastal Plain is charac-terized by a gentle seaward slope, smooth and monotonous, interruptedby long tidal inlets. The rivers expand towards- their mouths in reedy. Ssas&a^^jrsaas^ Fig. 206. — Cypress trees of the Dismal Swamp. (Norfolk Folio, U. S. Geol. Surv.) marshes or in broad shallow estuaries barred from the open ocean bywave-built reefs that stretch almost continuously from Cape Lookoutto Cape Henry. The uplands and lowlands of this district have solittle difference in altitude that they could be scarcely distinguishedfrom each other if the lowlands were not almost at tide level. Thelowlands are the bay bottoms or the tidal marshes or the broad savan-nas which the highest tides barely fail to reach; the uplands rise inirregular scarps from a few feet to 15 feet in height to form stretches. ATLANTIC AND GULF COASTAL PLAIN 519 of excessively flat plain. Farther from the coast there is again a zoneof undulating surface; the depressions containing the waterways be-tween undulations are less conspicuous than in New Jersey and lowerMarylan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectforestsandforestry
