64 NEW YORK STATE MUSEUM 



Since no detailed study of this outlier has yet been published, 

 the observations made by the writer during the summers of 1916 

 and 1917 are here somewhat fully recorded. 



The dolomitic limestone is well exposed for a distance of fully 

 100 feet along the shore of the lake just north of the steamer 

 landing in the village. Plate 7 shows the general appearance of 

 the outcrop. The strike of the beds is N 50° E and the dip N 23°. 

 A detailed measured section follows : 



Feet Inches 

 6 Dolomitic limestone without chert 3 O 



5 Dolomitic limestone with much dark chert in the 

 form of irregular bunches up to 6 inches or even 

 a foot long 3 8 



4 Dolomitic limestone without chert or calcite 2 



3 Dolomitic limestone much like 2 below, except 



that chert is less conspicuous and not in layers. 3 8 



2 Dolomitic limestone with much chert mostly in thin 

 layers, but some in irregular bunches. Also 

 numerous veinlets and bunches of calcite, some 

 of which is dark to black with bituminous mat- 

 ter. On the weathered surface there are signs of 

 stratification surfaces separating the rock into 

 thin layers 5 6 



I Dolomitic limestone with considerable chert (below 



the water) 2 



Total 19 10 



The dolomitic limestone of this section is dark gray weathering 

 to light gray, crystalline, fine grained and compact in texture. It 

 contains numerous rounded quartz-sand grains not visible to the 

 naked eye, but bits of the rock treated with hot hydrochloric acid 

 leave considerable residues of the fine quartz-sand grains. Weath- 

 ered surfaces of the rock are generally rough and deeply pitted 

 due to more rapid removal of the irregular calcite bunches. 



The greatest thickness of limestone exposed in any one section 

 is in the bed of Rogers brook between its mouth and the main 

 road. These beds strike N 50° E and dip N 23°, and the stream 

 descends about 25 feet as a cascade over the ledge. The approxi- 

 mate thickness of this section, based upon careful pacing (160 

 feet) across the strike, is 85 feet. There are several intervals in 

 the section, a thickness of 5 or 6 feet being concealed in one place. 



