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This view shows the breakwater near the entrance to Overton Beach Marina harbor. This view is looking west toward Bitter Ridge with the Virgin Mountain in the distance. Outcrops of late Miocene-age sedimentary rocks crop out along the shoreline. Bitter Ridge consists of folded and thrust-faulted Paleozoic and Mesozoic-age sedimentary rocks. The Virgin Mountains in the distances consist mostly of sedimentary rocks of Paleozoic- (Late Cambrian, roughly 520 million years, to Early Permian, about 270 million years). These Paleozoic-age rocks are roughly equivalent to the sequence exposed in the Grand Canyon, but they have been folded and faulted by the tectonic development of the greater Rocky Mountain region in Mesozoic to early Tertiary time (roughly 100 to 50 million years ago), and the crustal extensional tectonics responsible for the formation of the basin and range structure of the southern Basin and Range Province beginning in the Late Miocene time (starting about 18.5 million years ago). |
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