Llano Uplift
Dome
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The Llano Uplift is a geologically ancient, low geologic dome that is about 90 miles in diameter and located mostly in Llano, Mason, San Saba, Gillespie, and Blanco counties, Texas. Wikipedia
Age of rock: Mesoproterozoic
Orogeny: Grenville orogeny
Range coordinates: 30°10′27″N 99°03′55″W / 30.17417°N 99.06528°W
Region: Texas Hill Country