Buck Hill Group mapped in southeastern part of the Marfa sheet, Presidio Co, west TX, in Permian basin. Shown on Correlation of Map Units as consisting of (ascending): Duff and Pruett Formations (undivided) and Duff Formation, Mitchell Mesa Welded Tuff [mapped as a unit of Vieja Group in the Sierra Vieja area], and Tascotal Formation. [Author states that correlation of volcanic rocks from area to area on Marfa sheet is uncertain--little attempt is made to correlate between areas. The rocks are described by area.] Age of group ranges from Eocene to Oligocene. Geologic map.
Source: GNU records (USGS DDS-6; Denver GNULEX).
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