The Llano Uplift is a roughly circular geologic dome of Precambrian rock, primarily granite, in Central Texas in the United States. It is located in the eastern region of the Edwards Plateau and northern region of the Texas Hill Country. The region is characterized by a central exposure of Precambrian granite (Town Mountain granite), surrounded by a ring of gneiss and schist (Valley Spring gneiss and Packsaddle schist, respectively, also Precambrian), which is in turn surrounded by uplifted lower Paleozoic strata. This area is rimmed by limestone ridges.