in the vicinity of Great Barrington, Mass, 269 
making the whole thickness of the schist between the jaws of 
limestone about 160 yards. The schist involved in the syncli- 
In the limestone of West Sheffield, two miles east of Mt. 
Washington, an opening has been made by Mr. Ralph Little 
of Sheffield, which has afforded some copper pyrites, with traces: 
of galena and blende, and also rutile in crystals one to two or 
three inches long and an eighth to a fourth of an inch broad. 
b. Canaan, Connecticut. 
observations—that the hard jointed quartzite may ass in the 
course of a few rods into soft friable quartzite; that 1t may 
graduate almost as abruptly into mica schist or mica slate, 
* This Journal, ITI, iii, 179. 
