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Acadia NP and Mesa Verde NP Geology 115 Acadia National Park (1916) on the Maine coast is a good example of igneous geology Acadia NP is located on Mount Desert Island and the adjacent Schoodic Peninsula Schoodic Peninsula Bass Harbor Head Ca sedimentary rocks rocks in central co Precambrian 543 Geology of Mount Desert Island (Acadia NP) A Millinocket Precambrian - Gn in northwest. Lim sandstone, slate, a rocks in central co ? Greenville Calais A Rangeley Eastport Geologic c Bangor Machias Generalized regi Mount Desert Island Augusta B Portland Kittery Casco Bay “Mostly granite” Penobscot Bay “Mostly sandstone and slate; some volcanic” Modified from Guidotti 1985, Bedrock Geologic Maine Geological Surve Bass Harbor Head – “Cadillac Mountain Granite” – Note the cliff-forming jointing in the rock Schoodic Peninsula – “Cranberry Island Series Volcanic Rocks” Schematic cartoon of glacial carving by a continental glacier Compare/contrast with glacial carving by valley glacier at Yosemite NP Jordan Pond – Example of glacial carving of U shaped valleys Mesa Verde National Park (1906) in southwestern Colorado is a good example of sedimentary geology high low Sandstone and shale erode at different rates The Cliff House Sandstone formation is relatively permeable but contains layers of less permeable shale which erodes the sandstone above it to form alcoves, in which the Pueblan culture built their structures. “Spruce Tree House” “Long House” “Cliff Palace” For an arid environment, Mesa Verde supported significant agriculture due to the presence of a good soil loess distribution in the Four Corners area water wind