NOTE ON THE GEOLOGY OF SOUTHWESTERN 

 NEW ENGLAND. 



In two papers entitled respectively, "On the Geological 

 Structure of the Mount Washington Mass of the Taconic Range" 

 ■and " On the Geological Structure of the Housatonic Valley lying 

 East of Mount Washington,"' the writer has considered the lime- 

 stone and schist masses of the area covered by the papers to be 

 each separable into two formations, the limestone alternating 

 with the schist and together comprising a series corresponding 

 to that of Greylock some thirty-five miles to the north. This 

 conclusion was reached from both lithological and structural 

 considerations. The strongest reason for believing the full Grey- 

 lock series to be present was the apparently anticlinal character 

 of certain ridges of Berkshire schist. These ridges were repre- 

 sented as Riga schist (equivalent to Berkshire) and the lime- 

 stone surrounding them as Egremont limestone which was sup- 

 posed to correspond to the Bellowspipe limestone of Greylock. 

 The areal continuity of this limestone with the limestone of 

 Canaan, which immediately overlies the Cambrian quartzite and 

 must therefore be considered Stockbridge, was explained by an 

 important strike fault which can be shown to follow approxi- 

 mately the course of the Housatonic River for a considerable 

 distance. 



As fully explained in the first of the papers the area is one 

 in which the structures indicating bedding have been largely 

 effaced during the folding and new structures have been devel- 

 oped. In only a few instances has it been possible to obtain a 

 sufficient number of reliable dip observations to determine with 

 certainty the nature of the folding. 



Since the papers above referred to were written further study 

 has been given to the area in the effort to find a locality where 



'Journal of Geology, Vol. I, pp. 717-736, 780-802. 



175 



