GEOLOGY OF THE REMSEN QUADRANGLE 



17 



Many outcrops of the Lowville may be seen extending along Black 

 river from the locality here described to the type locality at Low- 

 ville. Just below the mouth of Crystal creek some of the limestone 

 layers are clearly ripple marked. From trough to crest the ripples 

 are usually less than an inch in hight, while from crest to crest 

 the distance is only 1 or 2 inches. 



The Lowville is nowhere exposed in the southern portion of the 

 region, although a few miles off the map limits and between the 

 villages of Newport and Poland, along West Canada creek, a thick- 

 ness of over 20 feet may be seen. 1 



The Black River formation of the southwestern Adirondacks 

 consists of a few feet of alternating limestones and shales lying 

 between the Lowville and the Trenton, but not always present. 

 Actual outcrops of the Black River are nowhere visible within the 

 region here described, although the formation is probably present 

 to a greater or less extent under cover of the Trenton proper. A 

 few miles south of the map limits and along West Canada creek, 

 between Newport and Poland, about 7 feet of Black River limestone 

 and shale may be seen resting upon the Lowville. It also occurs at 

 several localities within the Little Falls district. 



Towards the northwest and a few miles off the map the Black 

 River formation outcrops along Black river. Within the map 

 limits, as above stated, the actual contact between the Lowville 

 and Trenton opposite the mouth of Crystal creek can not be seen 

 because of drift covering. Thus a thin layer 'of the Black River may 

 possibly be present there. 



The Trenton limestone proper occupies by far the largest ter- 

 ritory or more than one third the area of the whole quadrangle. 

 With the exception of the small Lowville area above described 

 the Trenton rocks are thought to overlap everywhere upon the 

 Precambric. In general this formation may be said to be made 

 up of thin bedded, dark bluish gray, compact limestones separated 

 by thin shaly layers, except the upper 25 to 35 feet which consists 

 of thicker bedded, gray, coarse crystalline limestones with thin 

 shaly partings. These rocks are everywhere highly fossiliferous, 

 the limestone layers at times being made up almost entirely of 

 shells. 



The type locality for the Trenton limestone is along West Canada 

 creek, at Trenton Falls, in the southern portion of the region under 



1 Prosser & Cumin^s. Sections and Thickness of the Lower Silurian Formations on 

 West Canada Creek and in the Mohawk Valley. N. Y. State Geol., 15th An. Rep't. 1898. 

 p. 628-29. 



