First published use of name. Intent to name, derivation of name, and type section not given. Is a local name, Pringle andesite, applied to a mica-augite-andesite that makes up the upper part of Pringle Hill west of Rosita, Custer Co, CO in the Las Vegas-Raton basin. Occurs as dikes. Age not stated.
Source: GNU records (USGS DDS-6; Denver GNULEX).
Forms stocks and dikes. Probably intruded after eruptions of some unnamed rhyolites and the Bunker Trachyandesite. The largest stock is west of Rosita in sec 29, T22S, R71W, Custer Co, CO in the Las Vegas-Raton basin. Is mineralogically a quartz-bearing latite, but chemically it is a rhyodacite. The Pringle Hill stock is rectangular, elongate to north-northeast, and has an areal size of 5,500 x 3,000 ft. Geologic map. Oligocene age.
Source: GNU records (USGS DDS-6; Denver GNULEX).
Is part of late cycle (27 to 26 m.y. b.p. or Miocene) of volcanic rocks at Rosita center, Custer Co, CO in Las Vegas-Raton basin.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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