300 



GEOLOGY OF THE THIRD DISTRICT. 



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Section at the Falls of Oneida ereek. 



The above section is taken at the creek from the falls upwards, before it changes its course 

 from east to west on entering Oneida valley. 



No. 1. The lowest mass is the Water-lime group, over which are the principal falls of the creek ; the 

 layer with diagonal divisions is the one burnt for lime ; under it, is a layer of the water-limestone. 

 The diagonal lines of the wood-cut are much too regular for a resemblance. 



No. 2, consists of a few layers of the Pentamerus limestone, with probably some portions of the Catskill 

 shaly limestone, but not well characterized. 



No. 3. Onondaga limestone. 



No. 4. The Comiferous limestone, with its parallel rows of flint ; the part above the flint being well 

 characterized Seneca limestone, and the Linear strophomena very abundant. 



No. 5. Lower part of the Marcellus shales, with interrupted beds of dark impure limestone ; the calca- 

 reous material in too great abundance to form septaria, and in too small quantity for regular layers. 

 The upper part, marked by narrow lines, represents two layers of similar limestone, with goniatites 

 and large orthocerae, with here and there a little white lamellar carbonate of lime and some orange- 

 colored utrbonate of iron. 



No. 6. The upper part of the Marcellus shales, the part which through Madison and Onondaga is of con- 

 siderable thickness, and without fossils so far as was noticed. These shales form the suriace mass 

 for some extent in that section, but are covered with alluvion. 



The best locality where the shales, and the Hamilton group, the next mass in succession, 

 may be seen in immediate connection, is at Cherry-valley, in the brook which passes by the 

 ashery southeast of the village. The water falls from the Hamilton group, passes over the 

 shales, and upon the surface of the upper layer of the Comiferous limestone, the latter forming 

 the bed of the brook near the ashery. 



