CHAPTER XV. 

 THE PLEISTOCENE PERIOD. 



LITERATURE. 



1818. B. Hitchcock. Geology of Deerfleld. Am. Jour. Sci., 1st series, Vol. II, 

 p. 107. 



1823. . Geology of Connecticut River. Ibid., Vol. VI, p. 80. 



1827. A. Xash. Lead Mines, etc., of Hampshire County. Ibid., Vol. XII, p. 248. 

 1833. E. Hitchcock. Geology of Massachusetts, pp. 33, 135. 



1835. . Geology of Massachusetts, 2d edition, p. 174. 



1841. 



1850. 



1852. 



1860. 



Geology of Massachusetts, Final Report, 4°, pp. 306, 332, 357. 

 Proc. Am. Assoc. Adv. Sci., Vol. Ill, p. 155. 

 Ibid., Vol. VI, p. 264. 



Illustrations of Surface Geology. Smithsonian Contributions to 

 Knowledge, Vol. IX, i)p. 1-155. Also issued separately. 



1863. . Reminiscences of Amherst College, pp. 260, 311. 



1871. J. D. Dana. On the Connecticut River Valley Glacier. Am. Jour. Sci., 



3d series. Vol. II, p. 233. Vol. V, 1873, pp. 198, 217. Vol. X, 1875, pp. 



180, 280, 353, 497. Vol. XII, 1876, p. 125. Vol. XXIII, 1882, p. 87. 



Vol. XXV, 1883, p. 440. Also published separately. 



1877. J. S. Diller. Westfleld during the Champlain Period. Am. Jour. Sci., 3d 



series. Vol. XIII, p. 262. 

 1877. . Westtield Times and News Letter, Vol. XXXVII, March 28, Sep- 

 tember 19. 



THE INTERVAL BET^VEEN THE TRIASSIC AND THE GLACLIE PERIOD. 



DEPOSITS. 



Within tlie area liere under survey the materials for a reconstruction 

 of the history of the hiter Mesozoic and the Tertiary are extremely scanty. 



With the exception of a single trap tahis beneath the lower till there 

 ai'e no known deposits left to represent these long ages. The excavations 

 for the Turners Falls branch of the Canal Railroad were carried along the 

 south side of the Deei-field River where the latter passes through the notch 

 in the Deei-field range to reach the Connecticut, and exposed at a height of 



