Editing Enchanted Rock (section)

==Geology==
[[File:GeologicalExfoliationOfGraniteRock.jpg|thumb|left|Geological [[Exfoliating granite|exfoliation]] of [[granite]] at Enchanted Rock State Natural Area]]
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 only the visible above-ground portion of a segmented ridge, the surface expression of a large [[igneous]] [[batholith]], called the Town Mountain Granite,<ref name="TXMap1992">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. [http://ngmdb.usgs.gov/Prodesc/proddesc_68390.htm]</ref> of middle [[Precambrian]] ({{ma|1082|error=6}})<ref name=Walker>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</ref> material that intruded into earlier [[metamorphic rock|metamorphic]] [[schist]], called the Packsaddle Schist.<ref name=TXMap1992/> The intrusive granite of the rock mass, or [[pluton]], was exposed by extensive [[erosion]] of the surrounding [[sedimentary rock]], primarily the [[Cretaceous]] [[Edwards Group|Edwards]] [[limestone]] that is exposed a few miles to the south.<ref name=TXMap1992/>