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Geology of National Parks Exam 1

Terms in this set (17)

Portage Lake (Lake Superior parks)
Volcanic rock/basaltic lava flows, Precambrian rock, rhyolite/conglomerates
Isle Royale (Lake Superior parks)
geological synclines, precambrian rocks, glacially polished bedrock (caused by pleistocene ice sheets), stacks and dikes, corrugated landscape
Apostle Islands (Lake Superior parks)
stacks, sea caves, arches, and undercut seacliffs; Keweenawan age rocks, sandstones of the Bayfield group, glacial till
Pictured Rocks National Lakeshore (Lake Superior parks)
late precambrian to early ordovician, sandstone units, quaternary glacial drift, Jacobsville Formation (fluvial/lacustrine, feldspar rich quartz sandstone), Munising Formation (basal conglomerate, hard Chapel rock sandstone), large sweeping cross beds and crumbly Miners Castle sandstone
Black Canyon of the Gunnison National Park
Gunnison river is a superposed stream, being let down into hard Precambrian rock, 2 million years old, West elk mountains
Grand Canyon
3 sets of rocks: Layered Paleozoic, Grand Canyon Supergroup, Vishnu Basement Rocks (different kinds in pic), mostly precambrian and paleozoic rocks, Colorado River
Shenandoah Valley National Park
Precambrian, cambrian, ordovician; Precambrian Pedlar formation (gneiss-1b years old, lots of foliation), granite intrusions, deposition of Swift Run Formation (feldspar rich sandstone/breccia), Catoctin Formation (flood basalt, columnar jointing, vesicles); limestone, sand, mud, rivers/beach, lava flows, granite
Blue Ridge Parkway
stretches from Pennsylvania southwest to Georgia; Precambrian metamorphic rocks such as schists, gneisses, slates, and quartzites intruded by igneous rocks
Great Smokey Mountains
Metamorphosed sedimentary rocks are the dominant rock types throughout the park, but some igneous rocks also occur; sandstone, siltstone, and shale are most common; anakeesta formation (limestone and dolomite); dikes; large boulders of metamorphosed sandstone are common in streams
Cades Cove
precambrian on the sides, ordovician in the middle
Acadia National Park
Ellsworth Schist (metamorphic rock) is the oldest rock unit; Cadillac Mountain granite is amongst the largest bodies of granite and the oldest in the region (~420 million years old.); The Bubbles; glaciers deposited materials and left piles of rock, gravel, and sand which are still present today
Glacier National Park
Glacial vallies, diabase sill, purcell sill (diabase/diorite on top, marble middle, siyeh limestone bottom), arretes, glacial valley, horns; Precambrian belt super group, Lewis Overthrust, Cretaceous Limestone
Grand Teton National Park
uplifted and downthrown blocks, diabase sill, cirques, terraces, precambrian metamorphic rock, gneiss, schist, granite
Great Sand Dunes National Park
Precambrian igneous and metamorphic rocks, Paleozoic and Mesozoic sedimentary rocks, and tertiary igneous and sedimentary rocks; began forming around 440,000 years ago, after Lake Alamosa dried up and the wind began to deposit
Rocky Mountain National Park
mesozoic and cenozoic; sandstones, conglomerates; plate activity is evident, lots of volcanoes
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