RT Journal Article SR Electronic T1 The Quaternian or Diluvian period, considered in its relation to the Present epoch JF American Journal of Science JO Am J Sci FD American Journal of Science SP 345 OP 353 DO 10.2475/ajs.s2-31.93.345 VO s2-31 IS 93 A1 F. J. Pictet YR 1861 UL http://www.ajsonline.org/content/s2-31/93/345.abstract AB