Roadside Geology of Washington
The story of Washington geology is a matter of getting the pieces of the state together. As it moved West, the North American continent collected scraps of continental and oceanic crust once widely scattered over the vast emptiness of the eastern Pacific, and assembled them into the geologic mosaic that is Washington. But each of the pieces retains its distinctive character as a place once separate, still not completely assimilated into the larger whole. This book identifies the pieces of Washington, points out the seams between them, and tells how and when they got to where we know them now.
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The Northeastern Highlands
The North Cascade Subcontinent
4 other sections not shown
andesite basalt lava flows basin batholith bedrock beneath Cascade volcanoes Columbia Plateau Columbia River consists contain continental crust dark andesite deposits dunes eastern Washington Eocene eroded erupted exposed exposures feet flood basalt folded formation fossils geologic geologists call gneiss graben Grand Coulee granitic magma gravel gray Helens highway ice age igneous Kootenay arc Lake landscape last ice age layers magma mantle melted metamorphic rocks million years ago Miocene moraine Mount Baker Mount Rainier Mount St Mountains mudflow North Cascade micro-continent North Cascade subcontinent ocean floor oceanic crust oceanic trench Okanogan subcontinent Okanogan trench Okanogan Valley Olympic Peninsula Oregon Pacific Ocean pillow basalts plate plateau basalt pluton Puget Sound lowland Quincy basin Republic graben rhyolite roadcuts sand sandstone scablands sediment sedimentary rocks sinking slab of oceanic soil Spokane floods steam Straight Creek fault surface Swauk trench filling Wenatchee Western Cascades Willapa Hills Yakima