Table Butte Tuff Member of Leach Canyon Formation of Quichapa Group. Moderately welded and contains from 15 to 20 percent lithic fragments. Also made up of 1 to 3 ignimbrites. Contains phenocrysts of plagioclase, quartz, sanidine, and minor biotite. Overlies Narrows Tuff Member (new). Age is Miocene.
Recognized in southwestern Utah and southeastern Nevada. [Type locality: Table Butte, in NE/4 NE/4 sec. 5, T. 34 S., R. 14 W., Avon NW 7.5-min quadrangle, Escalante Desert, Iron Co., southwestern UT (fig. 1, loc. 3 of Williams' dissert.; see Rowley and others, 1975, and Anderson and Rowley, 1975).]

Source: US geologic names lexicon (USGS Bull. 1350, p. 742).

Pg. B10-B11 (fig. 2), B12-B13; see also Anderson and Rowley, 1975, GSA Spec. Paper 160, p. 1-51. Table Butte Tuff Member of Leach Canyon Formation of Quichapa Group is adopted by the USGS [following Williams, 1967, Univ. Washington PhD dissert.; Cook, 1965, Nevada Bur. Mines Rpt., no. 11]. Is upper of two members of Leach Canyon. Consists of white, pale-salmon or brown welded to partially welded ash-flow tuff; thickness rarely over 15 m. Overlies Narrows Tuff Member of Leach Canyon; underlies Bear Valley Formation (not part of Quichapa). Age is Miocene.
Type locality: Table Butte, in NE/4 NE/4 sec. 5, T. 34 S., R. 14 W., [Avon NW 7.5-min quadrangle], Escalante Desert, Iron Co., southwestern UT.

Source: Publication; Changes in stratigraphic nomenclature, 1976 (USGS Bull. 1435-A, p. A102); GNU records (USGS DDS-6; Denver GNULEX).