America's Volcanic Past
|"Though few people in the United States may actually experience an erupting volcano, the evidence for earlier volcanism is preserved in many rocks of North America. Features seen in volcanic rocks only hours old are also present in ancient volcanic rocks, both at the surface and buried beneath younger deposits." -- Excerpt from: Brantley, 1994|
Volcanic Highlights and Features:
|[NOTE: This list is just a sample of various Vermont features or events and is by no means inclusive. All information presented here was gathered from other online websites and each excerpt is attributed back to the original source. Please use those sources in referencing any information on this webpage, and please visit those websites for more information on the Geology of Vermont.]|
Vermont has a number of rock and mineral based industries that are important
both historically and economically. Vermont has three State
Rocks - granite, marble and slate.
Vermont's Cambrian Rocks:1
Vermont's Ordovician Rocks:1
Vermont's Silurian-Devonian Rocks:1
|Vermont's Volcanic Rocks|
Vermont State Rocks:1
Vermont is host to a great variety of rock types which are valued as dimension stone (stone used in the construction of buildings and structures, as well as for sculptural media). Vermont's State Rocks, granite, marble and slate, are known for quality the world over.
Vermont's Igneous Rocks:1
Granite, syenite, basalt, dunite, peridotite, and serpentinite. Granite and serpentinite being predominant or important.
Granite, an igneous rock, occurs as small to large plutons in eastern Vermont. Most granite in Vermont is part of the New Hampshire Plutonic Series and is Devonian in age, making it quite a bit younger than the slates and marble of western Vermont. The granite from Barre is world famous for its use as monument stone.
Granite, marble, slate, talc, verde antique, soapstone, schist, sand and gravel, crushed limestone, marble, dolomite, granite, quartzite and slate are all products of Vermont. In 2000, the estimated non-fuel mineral production for Vermont was $74.6 million (USGS Mineral Industry Survey).
|Ascutney State Park|
Ascutney State Park:2
The original park, being the summit road, the stone toilet buildings, campsites 1 to 18, and the ranger's quarters had all been completed by 1939 when the CCC camp moved to Okemo. The stonework is all of Ascutney granite. The ranger's quarters and entrance are at an elevation of 550 feet. The summit road wends a steep path through mixed hardwoods to a parking lot at an elevation of 2,800 feet in a saddle between the south peak and summit. A 0.8 mile foot trail takes you the additional 344 vertical feet to the summit.
At one time, there was a granite quarry on the east side of Crystal Lake. Near the turn of the century, steamboats barged stones across the lake. The park's beach house was made of granite quarried beside the lake. It was constructed in the late thirties by the CCC. It has a very unusual architectural design and received prominent recognition the year it was built. Crystal Lake is approximately three miles long and about one mile in width. In some places it is known to be more than 100 feet deep. It is a glacial lake beautifully situated among roughhewn mountain sides.
The Green Mountains are comprised of folded and faulted metasedimentary rocks, metamorphosed volcanic rocks and slivers of ocean crust (serpentinized ultramafic rocks). Talc, soapstone, and verde antique are associated with the ultramafic rocks.
Hazen's Notch Natural Area (273 acres), Hazen's Notch State Park, Town of Westfield, Vermont: Hazen's Notch is a steep-walled gap between Sugarloaf and Haystack Mountains, with impressive south-facing cliffs. The cliffs are of serpentine rock and support rare alpine and serpentine-adapted plant species. Peregrine falcons nested here historically. The Long Trail passes through the Natural Area.
1) Vermont Geological Survey Website, 2001
2) Vermont Department of Forests, Parks, & Recreation Website, 2001
3) USGS/NPS Geology in the Parks Website, 2001
America's Volcanic Past - States and Regions]
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