Geology of Sexeca County. 9Y 



A very interesting exposure occurs in the main (southern) 

 glen at Lodi. Near the mouth of the ravine it begins in 

 full thickness, with Hamilton shale below. It forms the bed 

 of the stream for a quarter of a mile, dipping on the average 

 N. W. The view shows the upper beds eroded by the stream, 

 with Genesee shale above. When last visible it presents its 

 upper surface as the bed of the brook with Genesee upon it, 

 having risen about 40 feet. 



This anticlinal is seen in the next hollow, its top 55 feet above 

 the lake at 400 feet from it, and in the hollow, a mile south of Lodi 

 landing (at a small wharf), it is again seen at 50 feet at a greater 

 distance back. The shore is here composed entirely of drift. 

 This was the last distinct exposure noted. Genesee shale appears 

 half a mile farther south in the cliff. 



Returning to the high point whence we started, we find a low 

 swell of land running E. by S. from the quarry, for some dis- 

 tance very full of the pieces of the rock. Toward Hayt's Corners 

 it has been opened in places. I was told the drift was not thick. 

 At the Corners the Ovid branch railway cuts across the lime- 

 stone and Hamilton shale a few rods south of the station. 



Its further course is determined by a quarry a mile S. E. of 

 the Corners, thence by considerable falls in Grove's creek. Shel- 

 drake creek, the stream next north of Kidder's and the series of 

 streams for two miles south of Kidder's. In two of the latter, 

 the formation is 13^ feet thick. It comes within a few yards of 

 the lake at Bergen's Point, where it forms a fall, about 25 feet in 

 height, in Shepson's gulley. Thence- it slowlv descends, reaching 

 the level of the lake in about three-fifths of a mile, and entirely 

 disappearing beneath the lake at two and one-half miles, or a mile 

 south of Little Point. The Genesee shale is visible in one or 

 more places on the shore. 



Genesee Shale. 



This is well displayed in most of the gullies of Ovid, Lodi 

 and Covert. Its base is defined by the Tully limestone. Its 

 upper limit is fixed by two feet or more of harder material, 

 forming the base of the Portage system, to be described here- 

 after. 



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