EARTHSC 1105 Lecture Notes - Lecture 7: Blue Ridge Mountains, Shenandoah National Park, Grenville Orogeny
15 Nov 2016
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Document Summary
79,579 acres is wilderness (40% of the park) Earliest evidence of civilization 4,500 bce. Domestication of plants and livestock 900 ce. Native american tribes: the piedmont siouans, catawbas, shawnee, delaware, cherokees, susquehannocks, iroquois. European settlers arrived during the 16th century. Treaty of albany 1722: pushed iroquois west of blue ridge mountains. Lancaster treaty 1744: removed iroquois from the area west of blue ridge mountains. Established as a national park in 1935. Granite (a: igneous rocks formed from molten material, granite felsic, intrusive igneous rock, metamorphic rocks formed from re-crystallized pre-existing rocks, gneiss foliated, bands of feldspars and quartz. Dike igneous intrusion which cuts across layers. Oceanic crust mafic in composition, ~6km thick, dense. Continental crust felsic in composition, ~25-70 km thick, less dense than. Weathering wearing away of rock due to wind or water. Limestone formed from caco3-producing photosynthetic organisms. Allochthonous zone terrane of foreign rock. Frost wedging progressive fracturing of rocks caused by the cyclical.
