240 



Report of the State Geologist. 



Section H. Only about a foot and a half of the Moscow shales are 

 exposed near the lower end of this section, the greater part of the section not 

 showing them at all. The following are the measurements of the strata exposed 

 above the Moscow shales. 



Black Naples (Gardeau) - . . . 40 feet. 



Grey Naples (Cashaqua) ....... 30 feet. 



Black Genesee 9.5 feet. 



Grey Genesee - - • - - - ■ • • 8.5 feet. 



Styliolina limestone ......... .5 feet. 



Conodont limestone • .25 feet. 



Shale with spores - ■ - - - - - • .25 feet. 



The length of the section is about eight hundred feet. 



First South Shore cliff. The part of the cliff here considered extends 

 southward along the lake shore from the mouth of Eighteen-mile creek to 

 Pike creek, a distance of about one and one-half miles. The height varies 

 greatly in different parts of the section but does not exceed sixty oi» seventy 

 feet. The strata dip gently southward, and while about forty feet of the 

 Lower shales are exposed at the northern end, these have entirely disappeared 

 at the southern end, where the Moscow and Genesee shales are alone seen in 

 the cliff. In the highest portion of the cliff the Naples shales are exposed, while 

 the Encrinal limestone forms a prominent bed throughout the greater part of 

 the section. The Styliolina bed thins out southward, its thickness at the 

 southern end of the section being less than an inch, the rock assuming a shaly 

 character. The Moscow shales soon disappear from the section beyond the 

 mouth of Pike creek, and the remainder of this and the succeeding sections 

 on the lake shore show only the Genesee and Naples shales. (Plate IV). 



Evidence of Disturbance. 



Faults. Several small faults are shown in some of the sections. They 

 are all reversed or thrust faults. One shown in section D, at Eighteen-mile 

 creek, has a vertical displacement of about two feet, while several smaller ones 

 shown in section A, have a vertical displacement not exceeding half a foot. A 

 larger and more complicated fault is shown in the South Shore cliff, about a 

 mile south of the mouth of Eighteen-mile creek. In the relatively rigid Encrinal 

 limestone, complete separation along the thrust plane is produced, a vertical dis- 

 placement of several feet resulting. In .the Genesee shales the fault passes into 

 a broken flexure, a crushed zone marking the plane of deformation (Plate V). 



FolJs. A single small anticlinal fold appears in the upper Moscow shale 

 at tlx- southern end of section E, in Eighteen-mile creek. 



