Big Blue Spring and springs at Charnock Ranch are in Secs. 16, 29, and 32, Tl3N, R44E on the east side of Big Smoky Valley and have reported temperatures of 26.6°C and 32ºC (Fiero, 1968; Trexler and others, 1979, Table 1). Big Blue Spring is associated with a fault scarp cutting alluvium (Fiero, 1968). Springs reportedly issue from a large mound, and a travertine deposit is reported in an area in the vicinity of Sec. 28, Tl3N, R44E. According to Garside and Schilling (1968, p. 55), thermal waters are also reported in this general area at Turk's Ranch (T13N, R43E)? and R.O. Inc. Ranch (Tl2N, R43E)?.