Supposed 

 erosion of the 

 Upper 

 Etcheminian. 



Acadian divi- 

 sion of the St. 

 John group. 



30 



It is assumed above that the upper division of the Etcherainian ends 

 at the great conglomerate named below. If, however, the lower con- 

 glomerate, 15 feet, (named above) be taken as the base of the St. John 

 group (there are three conglomerates in it on McMullin brook), there 

 are only 45 feet of measures of the Upper Etcheminian at Boundary 

 brook, whereas on Dugald brook there are 230 feet. At Vincent Mc- 

 Phee's farm, half a mile north-east of Boundary brook, the Upper 

 Etcheminian is 120 feet thick. The nature of the Upper Etcheminian 

 sediments is such as to make it improbable that the great differences 

 in the bulk of this member can be due to variation in its original 

 thickness. It is more likely to be due to erosion of this division before 

 the deposition of the St. John group, or to faults that have cut out a 

 great part of this member of the series. 



70 feet felsite conglomerate, with pebbles of felsite, <fec. 



20 feet gray ochrous-weathering clay slate. Impressions of sea- 

 weeds in lower part. 



20 feet hard compact gray slate. 



20 feet measures concealed. 



20 feet light buff felsite conglomerate with ochrous spots. 



40 feet measures concealed. 



40 feet gray flags and sandy slates, followed by gray flags and 

 quartzites. 



The Acadian division of the St. John group would come into 

 230 this part of the section. 



Jphannian 

 division of 

 this group. 



50 feet gray felsite-conglomerate. 

 40 feet gray slate and quartzite. 

 60 feet measures concealed. 

 30 feet channel of Indian brook. 



180 Part of the Johannian division. 



This last portion of this section may be assigned to the Johannian 

 division of the St. John group, but it is obviously only a small portion 

 of this division. Possibly the eighty feet (40 + 40) here assigned to 

 the Acadian division should be transferred to the Johannian. 



