68 NEW YORK STATE MUSEUM 



Chazy. The other outcrop comprises 150 feet in one continuous 

 section and amounts altogether to about 300 feet of rock, consisting 

 mostly of steel-gray to bluish gray compact dolomitic limestone 

 with rough surfaces on the weathered beds, suggesting D^, and 

 sandy limestone in thin beds weathering on the edges in horizontal 

 ridges and denoting D3. Indistinct sections of gastropods were 

 observed in several beds. 



Although it would seem desirable to map separately the divisions 

 of a formation aggregating 1800 feet in thickness, the scattered 

 position of most outcrops and the obvious presence of numerous 

 tectonic disturbances, indicated by the varying dips, would not have 

 allowed anything approaching correctness in the drawing of the 

 boundaries. Only on the east side of the Westport area, along the 

 lake shore the boundaries of the divisions could be drawn in and 

 continued according to the prevailing north northwest strike in this 

 region for some distance. But the western continuations of these 

 boundaries are entirely lost under the Champlain clays and the 

 accompanying description will suffice to locate the divisions along 

 the shore. AVe have also refrained from separating as a distinct 

 unit on our maps the Cassin formation from the rest of the Beek- 

 mantown, although its recognition as a distinct unit is urged by 

 Professor Gushing, apparently on good grounds. This Cassin 

 formation is to comprise the upper portion of D and all of E. In 

 the areas here under discussion it is exposed around Cole bay, 

 between the highroad and the fault scarp near the northern 

 branches of Beaver brook, and it also is represented in the out- 

 crops on Crown Point peninsula. 



It is also probable that the division A, amounting to over 300 

 feet of rock, will in time be separated from the Beekmantown bv 

 Dr Ulrich who considers it the eastern representative of a separate 

 formation having possibly even the value of a system that is frJIv 

 developed in the Mississippi basin. At any rate, there is good 

 evidence that a strong unconformity separates division A from the 

 rest of the Beekmantown. The rocks of A are best exposed in the 

 cliff north of Port Henry through which the tunnel passes. Less 

 favorable exposures are found at Cold Spring bay and near the 

 base of the fault scarp in the Westport area. The northernmost 

 of these exposures is a small abandoned quarry ^ mile north of 

 Westport and ^4 mile east of the railroad track. 



Chazy formation. The Chazy is exposed in complete sections 

 in two places, viz, in the Westport area where the section extends 



