100 C. S. PEOSSER DEVONIAN AND SILURIAN ROCKS. 



Depth. Thickness. Kind of rock. Formation. 



Feet, Feet. 



2,978 4s._l Lightish gray, with some dark gray 

 magnesian limestone; effervescence 

 very slight in cold HC1, hut becomes 

 strong on heating Trenton. 



3,0262 Bottom of well. 



The well begins in the colored marls of the Onondaga Salt group, and 

 reaches the Clinton at a depth of 567 feet. The thickness of the dif- 

 ferent stages in this well is as follows: Clinton, 323 feet; Oneida con- 

 glomerate, 12 feet; Medina sandstone, 508 feet; Oswego sandstone, 107 

 feet ; Lorraine shales and sandstones of the Hudson series, 640 feet ; 

 Utica shale, 233 feet, and penetrates the Trenton limestone to a depth 

 of 636* feet. 



Utica {Globe Woolen Mills) Well and Section. — A well was drilled by the 

 Globe woolen mills to the depth of 1,720 feet in the city of Utica, near 

 the level of the Erie canal, and the samples were kindly placed at my 

 disposal for study by Mr Charles D. Walcott, of the United States Geo- 

 logical Survey. This well is about thirty-one miles east of Chittenango 

 and twenty-five northeast of Morrisville. 



SECTION OF THE GLOBE WOOLEN MILLS WELL AT UTICA, NEW YORK. 



Approximate altitude, J+28 feet. 



Depth. Thickness. Kind of rock. Formation. 



Feet. Feet, 



370 200 Clear, black argillaceous shale with brownish 



streak, slightly calcareous Utica shale. 



570 330 Dark blue limestone ; strong effervescence in 



cold HC1 ; fragments of fossils at 650, 810 

 and 850 feet ; fragments of brachiopods at 



730, 750, 790 and 830 feet Trenton limestone. 



900 180 Drab to bluish-gray massive limestone, which 

 effervesces strongly in cold HC1, and light 

 gray, glistening limestone, which does not 

 effervesce strongly in cold HC1 " " 



1 ,080 180 Light gray powder, which is strongly calcare- 

 ous ; very marked effervescence in cold 

 IIC1 Calciferous (?). 



1,260 140 Slightly brownish-gray sample, composed 

 largely of white vitreous quartz grains with 

 some mica grains ; non-calcareous Calciferous. 



1,40!) 320 Mainly light gray samples, composed chiefly 



of white or vitreous quartz grains; some 

 are of slightly brownish color, and part of 

 the samples are quite badly iron-stained. . Potsdam (?). 



1,720 Bottom of well. 



