204 



N. IT. Davton — Oneonta and Chemung 



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began 



my studies at Oneonta and 

 measured an instrumental section south- 

 ward past Franklin. From this I worked 

 eastward to the eastern front of the Cats- 

 kill, and westward to the latitude of 

 Binghamton. 



General results. — The accompanying 

 sections are intended to illustrate the 

 general relations : 



Fig. 1. — Section from central Broome 

 County, eastward through the Catskill 

 Mountains nearly to Catskill. 



It may be seen in these sections that 

 the Oneonta formation continues east- 

 ward with gradually increasing thickness 

 and comprises the lower thousand feet of 

 beds in the Catskill Mountains. Its 

 characteristics are unchanged and its 

 stratigraphic limits are distinct through- 

 out. Westward its red beds gradually 

 merge into the thin-bedded sandstone 

 and hard dark shales of the Portage and 

 disappear entirely between Norwich and 

 Cortland ; the red material extending 

 farthest west in the highest beds. 



The thin series of gray shales and fine- 

 grained sandstones, with Chemung fos- 

 sils, overlying the Oneonta formation 

 about Franklin, southwest of Oneonta, 

 are the basal beds of the great mass of 

 fine grained sediments which constitute 

 the Chemung formation in southwestern 

 ]STew York. They are overlain by seve- 

 ral thousand feet of hard, coarse, cross- 

 bedded gray sandstones with intercalated, 

 red shales and gray flags into which they 

 merge eastward and at the expense of 

 which they expand westward. This 

 merging was studied with great care and 

 it was found that stratigraphic continuity 

 throughout is beyond question. There 

 is no overlap or wedging out of the beds 

 either as a whole or singly but a gradual 

 transition of coarse materials into fine 

 materials. Lower and lower shaly beds 

 are successively involved eastward until 

 at a point about due south of Oneonta 



