GEOLOGY OF TEE PHILIPSBURG REGION OF QUEBEC 335 



This forrnation consists of light or dark blue limestone and marble- 

 ized quartzite and also dolomitic limestone. The prevailing blue 

 color and thin bedding distinguishes it from the Shelburne. Fossils, 

 although scarce, have been found. Some cephalopods and Ophileta- 

 like gastropods were collected by Schuchert who assigned them to 

 the "Saratogan." It is possible that this formation can be corre- 

 lated with B2 and B3 at Philipsburg. The presence here of the 

 trilobite Lloydia saffordi, which is highly characteristic of the 

 Middle Beekmantown at Philipsburg, makes such correlation seem 

 very plausible. 



CONCLUSIONS 



The purpose of this study of the Philipsburg section was to 

 gain new knowledge concerning conditions during early Ordovician 

 times. Although the fossil evidence to prove that the rocks of 

 Division A belong to the same system as those of the overlying 

 series is scant, nevertheless it at least in a small degree supports 

 the testimony of field evidence. The field evidence indicates that 

 no great break occurs until the end of the Beekmantown. It seems, 

 therefore, just as logical to include the rocks of Division A with 

 the Lower Beekmantown as to throw them into an older system for 

 which, at least in this locality, there is no favoring evidence, either 

 faunal or diastrophic. The divisions of the Beekmantown into 

 Lower, Middle, and Upper, proposed in this paper, are believed 

 by the writer to obtain generally in the Champlain Valley. To 

 carry these correlations further is not advisable at this time because 

 of the insufficiency of our knowledge. 



