216 



Report ok the State Geologist. 



A 5 as the Upper limit <>f the Hamilton. In the section t<> the north of Chase- 

 ville, which is one and one-half miles east of Whitney brook, the Hamilton 

 formation and fauna were found up to 215 feet above Schenevus creek. The 

 next 210 feet are covered, but it is probable that the Hamilton formation 

 extends considerably higher, since on the south side of Schenevus creek oppo- 

 site Schenevus and Maryland the combined thickness of the Sherburne and 

 Ithaca formations is about 500 feet, while it is 715 feet from the top of the 

 last Hamilton exposure in the brook north of Chaseville to the bottom of the 

 ( hieonta sandstone. 



XXII A 6 . About twenty-five feet above the top of A 5 , is the foot 

 of a cascade at a distance of about one and one-quarter miles from the 

 village. The rocks are bluish argillaceous, and even arenaceous shales that 

 w eather to a slightly olive tint. They contain but few fossils, though they 

 show plenty of fucoidal and mud markings. In this latter character and their 

 lithologic appearance they clearly resemble the Sherburne shales. Only frag- 

 ments of these fossils were found : 



1. Spirifer cf. mucronatus (Con.), Bill. (rr) 



2. .Liopteria DeKa/yi, Hall. (rr) 



XXI T A 7 . The lithologic characters of the shales between the two falls 

 are (piite similar to those below the falls, and they contain a few fossils. In a 

 thin layer about ten feet above the top of the lower falls are a considerable 

 number of specimens of IAngula. The complete list is : 



1. Lingula punctata, Hall (?). (c) 



The specimens are not quite as broad as the figures of this species, 

 except figure 6f, plate 1 (Palaeontology of New York, Vol. IV), 

 but the shell shows fine punctae. 



2. Tropidoleptus cari/naPus (Con.), Hall. (rr) 

 'A. Spirifer, sp. (rr) 



Two small and imperfect specimens. 



4. NuouUtes triqueterj Con. (rr) 



5. fidleroplhou, sp. (rr) 



Fragments that have markings somewhat like those of />'. Leda, 

 Hall. 



6. (0 Wtoilm * pitmata, Dn. (rr) 



Stem like the above plant, except that the branching is alternate 

 instead of opposite as in that species. 

 XXII A 6 . Near the top of the second falls, 290 feet above the Sche- 

 nevus creek, are bluish, slightly irregular shales, w hich contain a number of 



