PALEOZOIC ROCKS OF THE CANTON QUADRANGLE 4I 



Resume of Stratigraphy 



Inasmuch as the HeuveUon sandstone is the only one of the 

 Paleozoic formations on the Canton quadrangle that can be seen 

 in anything like continuous section from base to summit with both 

 contacts exposed, our knowledge of the thickness of the others 

 must finally depend on intelligent and accurately kept records of 

 deep wells or borings. Such records will be of great public service 

 if the drillers will cooperate with the State Geologist in making 

 them available. The composite section obtained by the uncertain 

 patching together of many scattered outcrops gives the following 

 recognizable divisions, in ascending order, with these approximate 

 thicknesses : 



Cambrian or Taconic 



Age uncertain, perhaps older than Saratogan 

 Typical Potsdam (red) sandstones and conglom- 

 erates o-i50-|- ft. 



(Possible unconformity) 

 Saratogan or Ozarkian 



"Potsdam" (Keeseville?) sandstone (mostly 



white) o?-iOO? ft. 



(Sequence interrupted; conformable else- 

 where) 

 Theresa mixed beds, dolomites and sand- 

 stones at least 50 ft. 



Age uncertain, probably Ozarkian 



Heuvelton white sandstone 10-25 ? ft. 



(Disconformity) 

 Ordovician or Champlainic 

 Canadian (Beekmantownian)^ 



Bucks Bridge mixed beds, dolomite and sand- 

 stone 50-75 ft. 



(Unconformity) 



Ogdensburg dolomite, basal part only perhaps 30 ft. 



(Section continued on the Waddington sheet) 



^ Dr P. E. Raymond has advanced the suggestion that the Tribes Hill 

 beds are Ozarkian rather than Canadian, so that our Bucks Bridge, if 

 equivalent, may need to be reclassified above. See Amer. Jour, of Sci., 

 30:344- 



