outcrop of eroded, dissected extinct volcano, Frio River
outcrop of eroded, dissected extinct volcano, Frio RiverPhotograph showing outcrop of eroded and dissected extinct volcano located adjacent to the Frio River and east of the city of Uvalde in Uvalde County, Texas. Basalt is remnant of volcanic neck, and adjacent to the basalt is pyroclastic material ranging from fine-grained material to volcanic bombs, which formed the slope of the volcano.