Kemp — Geology of Essex County. 



603 



The strikes and dips that were recorded are plotted on the map, but they 

 display such variability that no general conclusions can be drawn from them. 

 They will only be of value, in close detailed study in which every outcrop is 

 noted, so that step by step such structural details may be worked out as are 

 possible. 



Series III. Along the east and west highway in the extreme northeast 

 corner of the town, gneissoid rocks rich in garnets and doubtless derived from 

 moderately pyroxenic gabbros and norites, are the rule from Labier's at the 

 town line until the line of Newcomb is nearly reached. The usual basic 

 gabbro then appears and extends across into Newcomb, but near the highway 

 outcrops do not occur with all desirable abundance. Gabbros or black 

 gneisses and schists regarded as derived from them are found just south of 

 Van de Whacker creek at the crossing of the highway from Minerva to New- 

 comb. I map them as belonging with the gabbros, although from their 

 general metamorphism, the interpretation is not thoroughly established. 

 South of the Boreas river; gabbros of the usual basic type do appear, and 

 to and beyond Aiden Lair and eastward at Hewitt pond, garnetiferous 

 gneissoid rocks, clearly derived from sheared anorthosites, constitute the 

 ridges. At No. 123, just north of an abrupt eastward bend in the road, are 

 typical augen " gneisses derived from the labradorite rocks, and with large 

 nucleal labradorite " eyes " or " augen," left in lenticular shape. 



In the southwestern part of the town, near No. 115, black hornblendic 

 rocks are again met which are presumably derived from gabbro. Along the 

 eastern border, at No. 116b, and to the north the float, even that of a small 

 size, in the valleys is all of Series III, so that the hills to the north, which 

 were not easily reached within my limited time, are doubtless of this series 

 and a westerly extension of the same rocks visited in Schroon, just north of 

 Bailey pond. They connect the latter with the Hewitt pond exposures 

 mentioned above. 



Series IV was not met, and it is not likely that it was ever present, 

 unless in the Hudson valley, of which I see no evidence. 

 Series V. No trap dikes were met. 



Series VI. Glacial gravels are not infrequent and boulders of the 

 massive anorthosites and gabbros from the peaks in Newcomb are very com- 

 mon along the highways. They furnish very fresh and accessible illustrations „ 

 of the general character of these rocks. The large area that is covered by 

 sand and gravel along the north border, where the highway crosses from 

 Minerva to Newcomb, begins in Minerva, but is most extensively developed 



