258 



GEOLOGY OF OLD HAMPSHIRE COUNTY, MASS. 



present position by faulting oi- inversion, and since the schist occui-s both 

 below and above the limestone in apparent conformity, one or other of 

 the beds must be newer than the latter. 



Both of the members of the Coos group being thus proved to be of 

 the same age as the limestone — the quartzite by containing fossils and tlie 

 schist by conformity with the latter and with the limestone — numerous 

 examples of visible and conformable conjunction of the hornblende-schist 

 and gneiss with both the mica-schist and the quartzite in the area between 

 Bernardston and South Vernon are given, together with instances of the 

 passage of the one rock into the other, in proof that these rocks are there 

 all of Helderberg age. 



Order of succession of rochs in the Bernardston region. 



