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Maine's geologic past is unknown prior to 650 million years ago, although some geologists have suggested that rocks over a billion years old may be present in units of the Chain Lakes in northwestern Maine. The state is made up of three distinct terranes, including Laurentia, Iapetus Ocean terranes and the former microcontinent of Avalonia.
Abrasion also produces rock flour which is visible in glacial outwash plains across New England. Maine has some of the longest eskers in the world. [12] As the climate began to warm, the glaciers began to melt and drainage from meltwater under the glacier formed huge torrents of sediment that, when compacted, left a long and sinuous ridge or kame.
[3] [8] [10] The remainder of the pluton then cooled at a much faster rate for another 50 million years in another phase related to tectonic uplift. [ 8 ] [ 5 ] Although the Sebago Granite is igneous in origin, the muscovite present throughout the unit indicates some partial melting of surrounding sedimentary or metasedimentary rocks at some ...
Native American. Native Americans once traveled great distances to Mt. Kineo to acquire its rhyolite rock. This rhyolite is evidence of an igneous (volcanic) phase although the mountain formations also contain slate and sandstone demonstrating sedimentary and metaphoric history as well.
Phosphorite – Sedimentary rock containing large amounts of phosphate minerals – A non-detrital sedimentary rock that contains high amounts of phosphate minerals; Sandstone – Type of sedimentary rock; Shale – Fine-grained, clastic sedimentary rock; Siltstone – Sedimentary rock which has a grain size in the silt range
A concretion is a hard and compact mass formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. [1] Concretions are often ovoid or spherical in shape, although irregular shapes also occur.
The Marcellus Formation or the Marcellus Shale is a Middle Devonian age unit of sedimentary rock found in eastern North America.Named for a distinctive outcrop near the village of Marcellus, New York, in the United States, [3] it extends throughout much of the Appalachian Basin.
An undisturbed, sphagnum bog considered one of the largest and finest in Maine. Gulf Hagas: 1968: Piscataquis: federal (Appalachian Trail) Waterfalls, cliffs, and growth of spruce-fir forest on the gorge walls give the site unusual scenic beauty. The Hermitage