102 C. S. PROSSER DEVONIAN AND SILURIAN ROCKS. 



west of Chittenango. The altitude of Onondaga lake is given* at 361 feet,* 

 so that the altitude of the mouth of the well may be called approximately 

 365 feet. This well was drilled to the depth of 1,965 feet. One hundred 

 and seventy-five samples were saved and the record of the well was pub- 

 lished by Dr F. E. Englehardt in 1885.f 



Later Dr Englehardt kindly donated this set of samples to the United 

 States National Museum and the writer has carefully examined the 

 entire collection. 



SECTION OF THE STATE WELL NEAR SYRACUSE, NEW YORK. 



Approximate altitude, 365 feet. 

 Depth. Thickness. Kind of rock. Formation. 



Feet. Feet, 



430 25 Reddish, grayish, white and brownish- 



red quartz grains, with pebbly material . Drift, 



455 100 Chocolate-colored marl, slightly calca- 

 reous Onondaga Salt group. 



555 23 Green argillaceous shale or marl, slightly 



calcareous " " 



578 332 Bluish shaly limestone ; dark gray, glis- 

 tening limestone, which effervesces 

 very strongly in cold HO ; drab and 

 almost black shaly limestone Niagara limestone. 



910 98 Green argillaceous non-calcareous shale, 



with greenish-gray limestone. At 995 

 feet oolitic iron ore with green shale. . Clinton. 

 1,008 38 Grayish and brownish arenaceous chips, 



very slightly calcareous at 1,008 feet, 

 which may probably be regarded as 

 the upper part of the Medina. Below 

 this grayish and whitish quartz grains 

 with a little greenish, argillaceous and 



arenaceous shale Medina, 



1,046 769 Slightly brownish-red and greenish sili- 



cious sandstone at 1,046 feet, Below 



this white, pinkish and greenish , 

 quartz grains, some greenish shale, but 

 chiefly brownish-red silicious sand- 

 stone ; also some greenish-gray sili- 

 cious sandstone Medina, S07 feet thick- 



1,815 150 Greenish-gray silicious sandstone and 



shale,with some blue argillaceous shale. ( )swego sandstone. 

 1,965 i Bottom of well " " 



♦Geological map of Onondaga county, in Ann. Rep. Supt. Onondaga Salt Springs for 1884. 



flbid., pp. 15-17. 



J The depth of sample 175 is marked as 1,965 feet, but Dr Englehardt gives the depth of the well 



j The 



1,9G9 



as 1,969 feet. (Ibid., p. 17.) 



