| Ellingwood Point |
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Geology (Ellingwood Point)Title: Geology of Ellingwood Point Entered by: rockdoc53 Added: 10/19/2010, Last Updated: 10/19/2010 Sources: Johnson, B.R. and Bruce, R.M., 1991, Reconnaissance geologic map of parts of the Twin Peaks and Blanca Peak Quadrangles, Alamosa, Costilla, and Huerfano counties, Colorado: U.S. Geological Survey Miscellaneous Field Studies Map MF-2169 Ellingwood Point is composed predominantly of 1.7 billion year old (Early Proterozoic) metagabbro, which is is a dark gray to very dark green, metamorphosed igneous rock of gabbroic composition, typically with phenocrysts of hornblende and plagioclase. A glacier formed the U-shaped valley and a series of tarns, Lake Como, Blue Lakes and Crater Lake, that reside in the valley west of the Blanca-Ellingwood cirque. |
