Pg. 8. Boyles sandstone member of Pottsville formation. Coarse, thick-bedded, quartzose sandstone, in places conglomeratic at base. Forms basal member of Pottsville formation in Warrior coal field [Jefferson County, northern central Alabama]. Thickness 100 to 600 feet. Probably = Shades and Pine sandstone members of Cahaba coal field, or = Pine sandstone alone. [Age is Pennsylvanian.]
[Named from exposure at Boyles Gap, north of Birmingham, northern central AL.]

Source: US geologic names lexicon (USGS Bull. 896, p. 245).

Pg. 27. Boyles Sandstone Member of Pottsville Formation. The basal resistant conglomeratic orthoquartzite unit of the Pottsville in the Warrior coal field. Consists of one or more persistent orthoquartzite sandstone beds interbedded with varying amounts of gray shale, thin-bedded micaceous sandstone, and locally one or more thin coal beds. Lower part generally conglomeratic; upper part may contain a few thin conglomeratic lenses locally. Thickness 200 to 700 feet; thinnest along southeast margin of the Warrior coal field near Birmingham and thickens westward and southwestward in subsurface. Can generally be separated into two sandstone units separated by a predominantly shaly unit. Present in Appalachian Plateaus province of northern Alabama. [Age is Early Pennsylvanian (Morrowan).]
See also Charles Butts, 1910, USGS Geol. Atlas of the US, Birmingham folio, no. 175; W.C. Culbertson, 1963, USGS Prof. Paper 450-E, p. E47-E50; W.C. Culbertson, 1964, USGS Bull. 1182-B, p. B16-B17; D.E. Raymond and others, 1988, Geol. Survey Alabama Open-file Rpt. on Jasper quadrangle, p. 8-11, 22-34.

Source: Publication.