Saturday, January 08, 2011

Mt kineo

I had an oil spill response job to do in rockwood last week. This pic is of m
Mt. Kineo. The frozen lake I am standing on is Moosehead.

  The geology of Kineo is pretty interesting.  The rocks are officially named the Devonian Tomhegan Formation Kineo Rhyolite member garnet rhyolite.

Native Americans in the area would use these rocks for spear point, cutting tools etc.  The Kineo rhyolite, a flint like blue-gray rock with small quartz crystals that could be shaped into spear points, knives, axes, and other tools.  Artifacts made of Kineo rhyolite have been founding hundreds of locations in Maine and at sites as far a field as Martha’s Vineyard and Nova Scotia. -referemce: some website

According to the usgs .
Consists of blue-gray, bone-white-weathering, massive, conchoidally fracturing felsite with quartz and feldspar phenocrysts; blue-gray, greenish-white-weathering, irregularly fracturing felsite with garnet and white feldspar phenocrysts; dark-blue-gray, greenish-white to light-gray-weathering tuff; blue-gray, chalky-white-weathering tuff containing felsite and pumice fragments and fine-grained volcanic debris (devitrified shards); rhyolitic felsite pebble conglomerate; and flow breccia resembling the felsite but containing numerous irregular felsite fragments in a matrix of same material. Thickness ranges from 0 to 4,000 ft. Underlies main part of Tomhegan formation; overlies Tarratine formation. Report includes geologic map and correlation chart. (ME003) Revised to include rocks previously mapped as both Heald Mountain Rhyolite and Kineo Volcanic Member of Boucot and Heath (1969). Exposed in Long Pond and Pierce Pond 15-min quads. Consists of weakly metamorphosed rhyolite ash-flow tuff, flows, domes, volcanic breccia, grit, and conglomerate as well as associated hypabyssal, garnet-bearing felsic intrusive rocks. Separately mapped intrusive garnet rhyolite in Tomhegan Formation, previously mapped as both unnamed garnet rhyolite and garnet rhyolite of the Kineo Volcanic Member by Boucot and Heath (1969), is now considered to be equivalent to Kineo. 

Maybe next time im up there Ill actually stop to look at the rocks. I totally didnt this time. Oh well, whatever. Next time.

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