GEOLOGY OF THE PHILIPSBURG REGION OF QUEBEC 327 



recemented by Kme dissolved from themselves. From this rock 

 a good collection of fossils was obtained. 



Half a mile south of Bedford a much sheared black limestone 

 dipping to the northwest is overlain by a band of conglomerate 

 apparently dipping to the southeast. Much shearing and crumpling 

 occurs at the contact. A thrust fault of minor magnitude probably 

 occurred here. This band of conglomerate is probably of a different 

 horizon from the one described above and belongs to Logan's D3. 

 Many large angular and sub-angular fragments occur and the 

 material is entirely unassorted as to size. 



Logan's conclusion that the lower strata of D were formed from 

 the breaking down of the massive beds of Ci is not substantiated 

 by fossil evidence. Nowhere in D has the thick-shelled gastropod 

 fauna of Ci been found. In fact, gastropods are conspicuously 

 absent from the fauna from D. Likewise the lithology of the con- 

 glomerates indicates that originally the strata of D were predomi- 

 nantly very weak and thin bedded. There is no evidence of any 

 thin bedding in Ci. 



Although the section from Di upward is in need of revision, 

 particularly the great thickness of slate which occupy the spaces 

 between the ridges of more resistent limestone conglomerate, a 

 few facts are clearly present which throw light on the genesis of 

 D. The intercalation of thin dolomitic beds with much of the 

 slate, the great abundance of slate, as well as the presence of shallow 

 water organisms in the paste of the conglomerate indicate a shallow- 

 water origin. The general absence of rounding in the fragments 

 of the conglomerate and their general allignment gainsay transporta- 

 tion and point to deformation of the unconsolidated beds in situ. 

 This deformation was probably due to the same forces which formed 

 the synclines and anticlines in the more massive underlying beds. 

 The sub-angular appearance of the fragments argues for a sub- 

 mergence and prompt recementation of the broken beds. 



If the thickness of D is anywhere near the 2,800 feet assigned 

 to it by Logan, deposition must have been interrupted many times 

 in the course of formation. The entire thickness is strikingly thin 

 bedded wherever bedding planes have not been obliterated by subse- 

 quent folding and recementation. 



