Charles R. Stern, Mario Vergara
Abstract
Vergara and Munizaga (1974) reported an age of 760,000 years for a sample of rhyolite-dacite obsidian from the mainly late Oligocene to Miocene Central Valley volcanic belt at Ancud, Chiloe (Fig. 1). They interpreted this sample as representing “a last and isolated volcanic event in this series”.
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Vergara and Munizaga (1974) reported an age of 760,000 years for a sample of rhyolite-dacite obsidian from the mainly late Oligocene to Miocene Central Valley volcanic belt at Ancud, Chiloe (Fig. 1). They interpreted this sample as representing “a last and isolated volcanic event in this series”.
Key concepts: Dacite, Rhyolite, Geology, Volcano, Geochemistry, Seismology, Volcanic rock, Paleontology