GEOLOGY OF THE AUBURN-GENOA QUADRANGLES 23 



No outcrops of the Tichenor are known on the gently sloping higher 

 part of the ridge between the lakes, but it is finely exposed at the top 

 of a fall in the Ensenore ravine 20 rods below the first highway 

 bridge over the stream west of the station. It is very rich in fossils 

 here, specially large trilobites and brachiopods, and there are several 

 characteristic masses of crinoid columns. 



It appears similarly situated and in the same condition in several 

 ravines south of Ensenore. 



The fossils found in the Tichenor limestone are members of the 

 Hamilton fauna and of the same species as occur in the Ludlowville 

 and Moscow shales. For list see State Museum Bulletins 69 and 99. 



Moscow shale 



The stratigraphic position of this formation is well defined on this 

 quadrangle by the Tichenor limestone at the base and the Tully lime- 

 stone at the top, both of which show a marked contrast to the medium- 

 dark gray soft shales of which it is composed, the few thin calcareous 

 lentils interstratified with the shales not being of sufficient import- 

 ance to cause any difficulty of identification. It has a thickness of 

 130 feet. 



The light colored middle and lower parts contain fossils in great 

 abundance, but in the darker upper beds they are comparatively rare. 

 For details of the fauna of the Moscow shale see State Museum 

 Bulletin 63. 



On the west side of Cayuga lake the large ravines of Bloomer, 

 Grove and Sheldrake creeks cut through the Moscow shale and the 

 numerous small ravines south of Kidders and the shore cliffs as far as 

 Little point show the upper beds to good advantage, and the entire sec- 

 tion is displayed between Taghanic point and a mile from the south 

 line of the quadrangle. 



On the east side of the lake, exposures of Moscow shale begin half 

 a mile from the south line of the quadrangle and, except for i % miles 

 south of Lansing where it is below the lake level, appear in all of the 

 ravines and shore cliffs for 12 miles toward the north to near King 

 Ferry (Clearview) and in the upper part of several ravines farther 

 north, also in the Paynes creek ravine and the one below Chapel 

 Corners. 



The more accessible and favorable exposures of the entire section 

 are : along the railroad south of Portland point ; in Shurgers glen and 

 the Salmon creek ravine ; the ravines near Atwaters and King Ferry 

 also show the whole section. 



