The minerals within the rock include quartz, plagioclase feldspar, microcline, and muscovite, with smaller amounts of biotite and tourmaline. Stone Mountain, though often called a pink granite dome, actually ranges in composition from quartz monzonite to granite and granodiorite. This misconception is most likely a result of misrepresentation by granite companies and early park administration. Numerous reference books and Georgia literature have dubbed Stone Mountain as "the largest exposed piece of granite in the world". The Stone Mountain pluton continues underground 9 miles (14 km) at its longest point into Gwinnett County. This magma solidified to form granite within the crust five to ten miles below the surface. It formed as a result of the upwelling of magma from within the Earth's crust. Primarily composed of quartz monzonite, the dome of Stone Mountain was formed during the formation of the Blue Ridge Mountains around 300–350 million years ago (during the Carboniferous period), part of the Appalachian Mountains. Stone Mountain is a pluton, a type of igneous intrusion. Geology Exposed granite at Stone Mountain The summit of the mountain can be reached by a walk-up trail on the west side of the mountain or by the Skyride aerial tram. The mountain, which ranges in composition from quartz monzonite to granite and granodiorite, is more than 5 miles (8 km) in circumference at its base. Stone Mountain, once owned by the Venable Brothers, was seen from the outset "as a memorial to the Confederacy." Stone Mountain Park officially opened on Ap– 100 years to the day after Lincoln's assassination, although the park had already been in use for a few years. The carving, completed in 1972, depicts three Confederate leaders, Jefferson Davis, Robert E. Stone Mountain is well known for not only its geology, but also the enormous rock relief on its north face, the largest bas-relief artwork in the world. At its summit, the elevation is 1,686 feet (514 m) above sea level and 825 feet (251 m) above the surrounding area. Additionally, the NTSB cited previous inaction to address emergency egress on amphibious passenger vessels with fixed canopies which impeded passenger escape from the Stretch Duck 7," investigators concluded.The park is owned by the state of Georgia and is currently managed by Herschend Family Entertainment. "NTSB investigators found that the accident vessel was originally constructed with a low freeboard, an open hull, and no subdivision or flotation, resulting in a design without adequate reserve buoyancy. Among other problems with the design of the vessels, the NTSB said they had insufficient "freeboard" - clearance between the deck and the waterline. All but nine of them were ignored, including a key recommendation to add "reserve buoyancy" to the boats, allowing them to stay afloat after taking on water. National Duck Boat Tour's Final Minutes Chronicled In Preliminary NTSB ReportĪt the NTSB teleconference, investigators reiterated that failing to implement all 22 recommendations the agency made after a previous duck boat sank in Arkansas in 1999, killing 13 people, contributed to the 2018 accident.
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