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^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue (aquamarine). ^ Florida's state gem, moonstone, was adopted to highlight Florida's role in the United States' Lunar program, which landed the first astronauts on the Moon. [81]
Many of Pennsylvania's water gaps cut through Blue Mountain including Delaware Water Gap, Lehigh Gap, Schuylkill Gap, Susquehanna Gap, and Swatara Gap. Also along the ridge, many "wind gaps" also exist. The rocks of the Blue Mountain section include mostly Silurian aged sandstone, conglomerate, siltstone, shale, and
Also contains layers of the matrix that contains blue and green slate as well as a conglomerate with quartz pebbles. [ 5 ] The Catoctin Formation found under the Chilhowee Group and above the basement rock(1.2-1.0 Ga) and is around 100–400 feet in thickness.
These are sourced from the neighboring Blackstone Group and Milford Granite (which has locally unique blue quartz). The two main rock types are interbedded with chlorite phyllite, which contains minerals such as muscovite, quartz, zoisite, magnetite and chloritoid. The formation may be the same age as the Roxbury Conglomerate in the Boston ...
The bedrock is primarily sandstone interbedded with shale, slate, quartzite, chert and limestone fragments. Blue Mountain is underlain by sandstone, with quartz-rich rock. More moderate slopes are underlain by shale. This bedrock does not provide significant ability to neutralize acidic pollution.
The Blue Ridge, Piedmont, Adirondack, and New England Provinces are collectively known as the Crystalline Appalachians because they consist of Precambrian and Cambrian igneous and metamorphic rocks. [14] The Blue Ridge Thrust Belt Province underlies parts of eight states from central Alabama to southern Pennsylvania.
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Blue Knob, a notable ski resort and recreational area, is also the state's second highest point at 3146 feet/959 m (after Mount Davis in Somerset County to the west). A transpression structure is located on the northern border of the county (shared with Blair County), about three miles east of the town of Woodbury.