208 NEW YORK STATE MUSEUM 



river Icvc^l. tliis would make the total thickness of the Marcellus 

 something over 225 feet, which is greater than that found in other 

 sections. It is jtossible that the dip here is less than in other 

 portions of the valley. A good exposure of the Marcellus beds is 

 found in the bed and banks of Ston}^ brook^ southeast of Schoharie. 

 At the " Three Corners " just above the 1000 foot contour line, 

 on the road leading up the hill along the banks of the brook, is a 

 cascade over the ui)per beds of the Onondaga limestone. About 

 50 vards above the bridoe near the confluence of the two branches 

 occurs an outcrop of " about 20 inches of dark gray, impure lime- 

 stone with Orthoceras marcellense [fig. 154] and 

 other fossils which usually accompany Agoniatites ex- 

 j) a 11 s u s , though that species has not been observed ".^ This is 

 the eastern extension of the Goniatite (Agoniatite) limestone, 

 which is a characteristic member of the Marcellus formation in 

 central New York. The elevation of this bed above the top of the 

 Onondaga is at the most 30 feet. 



For 16 feet above this the section is covered, then follows a con- 

 tinuous exposure of Marcellus shale for nearly a mile, to Borst's 

 sawmill, which is 180 feet above the limestone. The upper beds 

 in this section, though retaining their dark blue gray or blackish 

 color, carry Spirifer and Ohonetes and in this respect suggest cor- 

 respondence with the upper beds in western sections which have 

 latterly been regarded as pertaining to the Marcellus. 



Typical Hamilton sandy shales are exposed just above Borst's 

 mill. No limestone beds were observed in the section above the 

 basal limestone . . . The evidence in this section clearly indi- 

 cates the rapid extinction of the Agoniatites limestone eaistward 

 from Otsego county and at points east of that here mentioned no 

 oul crops of the horizon or evidence of its index fossils have been 

 recorded.^ 



Other exposures of the Agoniatite limestone are found on the 

 La!iioreaux farm, one mile southwest of Schoharie village, and 

 on the B-urton farm, one mile still farther south. "At these places 



'Not Stony crook, whioli is onst of Middlobiir.ir. This more iiortliorn 

 stroain occupies the depression between East hill and llartnian's hill. 

 ''Clarke, J. M. N. Y. State Mns. Bui. 40, p. 12.3. 

 Cnarke. Loc. rif. ]). 12H-24. 



