862 Tne American Geologist. Docembor, 1896 
Buff liniPRtone, (" Quarry rock"), T. C. Chamborlin, (1883). Geology 
of Wisconsin, vol. iv, p. 413. 
Lower Buff limestone, T. C. Chamberlin, (1883). Geology of Wiscon- 
sin, vol. I, p. 162. 
Buff bed, F. W.Sardeson, (1892). Bulletin Minnesota Academy of 
Natural Sciences, vol. in, p. 325. 
Buff limestone, C. W. Hall and ¥. W. Sardeson, (1892). Bulletin 
Geological Society of America, vol. iii, p. 360. 
Co-ordinate with the ButF limestone, an upper and larger di- 
vision was formerly recognized. 
"blue limestone.'" 
Blue Fossiliferous limestone, John Locke, (1844). Owen's Report on 
Iowa, Wisconsin, and Illinois, p. 153. 
Blue or Trenton limestone, I. A. Lapham, (1851). Geology Lake Su- 
perior Land District. 
Blue limestone, James Hall, (1861). Geology of Wisconsin, vol. i, p. 35. 
Blue limestone-Trenton limestone, J. D. Whitney, (1861). Geology of 
Wisconsin, vol. i, p. 162. 
Blue limestone or Trenton limestone, J. D. Whitney, (1866). Geolog- 
ical Survey of Illinois, vol. i, p. 166. 
Blue limestone or Trenton limestone, James Shaw, (1873). Geological 
Survey of Illinois, rep. vol. v, pp. 21, 38, 66, 86, 99, 111, 129. 
Blue limestone, T. C. Chamberlin, (1883). Geology of Wisconsin, vol. 
IV, p. 413. 
This limestone has been subdivided into three beds more 
nearly uniform with the Buff limestone. Beginning as be- 
fore, with the lowest, we have the 
LOWER BLUE LIMESTONE. 
Glass Rock and Upper Pipe Clay Opening, J. D. Whitney, (1861). 
Geology of Wisconsin, vol. i, p. 254, pi. vi. 
Lower Blue Beds, T. C. Chamberlin, (1877). Geology of Wisconsin, 
vol. II, p. 295. 
"Glass rock," T. C. Chamberlin, (1883). Geology of Wisconsin, vol. 
IV, p. 413. 
Lower Blue limestone, T. C. Chamberlin, (1883). Geology of Wiscon- 
sin, vol. I, p. 162. 
"Buff limestone," E. O. Ulrich, (1886). Fourteenth Annual Report 
Geological and Natural History Survey of Minnesota, p. 57. 
UPPER BUFF LIMESTONES, 
Brown rock, J. D. Whitney, (1861). Geology of Wisconsin, vol. i. p. 
253, pi. VI. 
Upper Buff beds, T. C. Chamberlin, (1877). Geology of Wisconsin, 
vol. II, p. 295. 
" Brown rock," T. C. Chamberlin, (1883). Geology of Wisconsin, vol. 
IV, p. 412. 
Upper Buff limestone, T. C. Chamberlin, (1883). Geology of Wiscon- 
sin, vol. I, p. 163. 
