202 Thirty-fifth Eeport on the State Museum. 



in an east and west direction, and incline very slightly to the south! 

 This condition maintains throughout the outlet and in the ravines 

 leading thereto wherever they are visible. The Tully may be traced 

 for many rods below the Oil mill, standing out in bold relief while the 

 shales above and below it crumble away. It disappears, having "run 

 out " and for about one-half mile we find the upper portion of the 

 Hamilton group (the Moscow shale) filled with its characteristic fossil 

 remains. One mile further down and forty feet lower we again find 

 the Tully with the Genesee slate above it and the fossiliferous blue 

 Moscow shales beneath, all almost perfectly level. It is impossible to 

 tell just where the fault occurs and its direction, owing to the superin- 

 cumbent soil. In Bruce's gully, a little further down, it is quite ap- 

 parent that the break occurs about twenty rods from the entrance, and 

 possibly by removing a few tons of soil the line could be found. 

 We should say that it followed the general direction of the outlet and 

 was, perhaps, its originating cause. 



Prof. S. G-. Williams, of Cornell University, examined the locality 

 with me and fully concurs in the opinion expressed. 



Tully Limestone. 



This formation varies in thickness from eleven to fourteen feet and 

 is divided into from three to five well-defined layers, varying in thick- 

 ness from one to four feet. The upper stratum is much the thinnest. 

 The upper surface of the third layer at Bellona is covered with pits of 

 many curious and suggestive shapes. Many people believe them to be 

 veritable tracks, and this belief has been strengthened of late by rea- 

 son of sensational accounts of the wonderful " tracks of men, children, 

 dogs, cows, mastodons," etc., which have been published by a corre- 

 spondent of a Eochester paper, who took plaster casts of some of the 

 mastodon and human (?) tracks and sent them to editors and scientific 

 men. 



It is evident that the " tracks " are solely the result of the eroding 

 action of the elements. Water has, without doubt, been confined in 

 its course between these layers. 



It is a fact that these cavities do, in many instances, bear a striking 

 resemblance to the tracks of men and animals. We have walked for a 

 rod or more, taking natural strides and stepping in well-fitting pits 

 each time. 



At several places the Tully limestone is much flexed ; at Bellona the 

 dip to the N. is 4°. In the town of Starkey it is undulatory. 



The two upper layers have a remarkable growth of corals. At Bel- 

 lona the following abound : Alveolites Goldfussh, Billings, Favosites 

 Argus, Hall, Zaphrentes simplex, Hall, Heliophyllum Halli, Edw. and 



