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Enchanted Rock
Enchanted Rock (16710 Ranch Rd 965, Fredericksburg TX) is an enormous pink granite pluton batholith located in the Llano Uplift approximately north of Fredericksburg, Texas and south of Llano, Texas, United States. Enchanted Rock State Natural Area, which includes Enchanted Rock and surrounding land, spans the border between Gillespie County and Llano County, south of the Llano River. Enchanted Rock covers approximately and rises approximately above the surrounding terrain to elevation of above sea level. It is the largest such pink granite monadnock in the United States. Enchanted Rock State Natural Area, a part of the Texas state park system, includes .〔(【引用サイトリンク】 publisher=Texas Parks and Wildlife Dept ) Texas Parks and Wildlife Dept〕 Designated a Recorded Texas Historic Landmark in 1936.
==Geology==
The prominent granite dome is visible for many miles in the surrounding basin of the Llano Uplift. The weathered dome, standing above the surrounding plain is known to geologists as a monadnock. The rock is actually the visible above-ground part of a segmented ridge, the surface expression of a large igneous batholith, called the Town Mountain Granite〔University of Texas at Austin, Bureau of Economic Geology, Barnes, V.E.,Hartmann, Barbara and Scranton, D.F., 1992, Geologic map of Texas: University of Texas at Austin, Bureau of Economic Geology, scale 1:500000. ()〕 of middle Precambrian ()〔Walker, Nicholas, ''Middle Proterozoic geologic evolution of Llano uplift, Texas: Evidence from U-Pb zircon geochronometry,'' Geological Society of America Bulletin 1992;104;494–504〕 material that intruded into earlier metamorphic schist, called the Packsaddle Schist.〔 The intrusive granite of the rock mass, or pluton, was exposed by extensive erosion of the surrounding sedimentary rock, primarily the Cretaceous Edwards limestone, which is exposed a few miles to the south of Enchanted Rock.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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