110 



C. S. PltOSSER — DEVONIAN AX!) SILURIAN ROCKS. 



690 feet of Trenton; the Fulton well, 650 feet, and the Wolcott well, 750 

 feet* 



A Generalized geologic Section along the Meridian of the 

 Chenango river from the Top of the Chemung down to the 

 Archean. 



In order to show the variations in the ahove section as compared with 

 our previous knowledge of the thickness of these terranes, a general 

 geologic section ranging through the same series of formations has been 

 compiled from books and geological articles. In this compilation the 

 maximum thickness of the terranes, as near the line of section as possi- 

 ble, has been taken. The notes following the section give the authorities 

 and references. 



Review of Authorities. 



Authority and reference for the thickness of the terranes, as given in 

 the preceding section. 



A. — Dr H. S. Williams estimated the thickness of the rocks from the 

 base of the true Catskill down to the horizon of the Genesee shale or the 

 top of the Hamilton, for the Chenango valley, as approximately '2.000 

 feet (Proc. Am. Assoc. Adv. Sci., vol, xxxiv, 1886, Chart on the " Merid- 

 ional Sections of the Upper Devonian Deposits of New York, Pennsyl- 



' Am. Geo)., vol. vi, p. 204. 



