324 



J. H. BRADLEY, JR. 



Although it cannot be definitely proved by field evidence, it is 

 probable that the province line section just described is crossed 

 by transverse dislocations, which are suggested by the terraced 

 nature of the outcrops. The occasional upturned dip of the lower 

 strata of A can be explained in this way. 



DIVESION B 



By far the most important rocks of the PhiUpsburg region are 

 those of the B series, because it is in them that structural features 

 can be best traced, and from them the most fossils evidence was 

 obtained. These rocks follow the beds of A and are well exposed 

 in a syncline just west of St. Armand Station (Fig. 2). From here 

 they strike across the township of St. Armand into Stanbridge, 

 where they are succeeded conformably, about one mile south of 



Fig. 2. — Diagrammatic section along the International Boundary, eastward from 

 Mississquoi Bay. P, Potsdam; A, Lower Beekmantown; B, Middle Beekmantown; 

 T, Trenton; F, fault. Horizontal scale, | inch =1 mUe; vertical scale exaggerated. 



Bedford, by the strata of the C series. The higher beds can be 

 traced from the vicinity of St. Armand village continuously to the 

 region where they are succeeded by the beds of C. These strata 

 are well described by Logan. 



DIVISION c 



Fossils were collected near the axis of the syncline from the 

 massive black limestone of B5 about one mile north of St. Armand 

 station on the Stanbridge road. The dip in the rocks at the roadside 

 is 2°-4° S.W. About 300 yards west, an outcrop shows a dip of 

 10° S.E., thus marking the synclinal structure. From the outcrop 

 on the road, several fragments of thick-shelled trilobites, and 

 brachiopods were found. In a somewhat lower bed on the western 

 flank of the syncline, surface indications of Maclurea ponderosa and 



ft^i 



