32 



Report of the State Geologist. 



of the village of McDonough, and still higher in the section, are fossil-bearing 

 jocks, and in the town of Pharsalia (Stations T, T 1 , T 8 ), at about the same 

 elevation in the section, there lies, above certain fossiliferous beds, a peculiar 

 fawn-colored cavernous sandstone which reproduces an Oneonta character, 

 inasmuch as a similar rock has been elsewhere observed, only with typical 

 Oneonta sediments at Station E, near Norwich. WestAvard of the Gene- 

 gantslet valley, evidences of these Oneonta beds may exist for a short distance 

 into the divide between the Genegantslet and Otselic rivers, but they have 

 not been observed in the valley of the latter stream. Traces of such red and 

 green beds may naturally be expected westward in Cortland county, inter- 

 calated among the deposits properly belonging to the Ithaca group, but none 

 have been seen by me. Such instances as those quoted serve to show that the 

 Oneonta deposits disappear westward both by thinning and recurrence, not 

 contracting to a single edge, but dovetailed by a number of edges or long 

 planes into the sediments bearing the Ithaca fauna. No recurrence of these 

 beds in the easterly region, where their development is pronounced and 

 typical, has been recorded. 



In the region along the Chenango valley, where the Oneonta beds have 

 not been penetrated by the straggling representatives of the western fauna, 

 opportunity is alforded of studying closely the important question as to the 

 composition and nature of the fauna succeeding the body of the Oneonta 

 deposits. This matter has already been referred to in my preliminary report, 

 and since then additional evidence has come into my hands which I shall take 

 the opportunity of presenting at this point. 



In the report referred to, attention was called to the outcrops on Juliand 

 hill (Station K) in the village of Greene. The first exposure here is about 

 150 feet above the Chenango river and not less than 100 feet above the top 

 of the Oneonta beds as exposed on Birdsall's brook. Several species were 

 recorded from the various exposures on the hill, which individually and collec- 

 tively give a decided Chemung expression to the fauna. The principal of 

 these were: Schizophoria impressa / Atrypa retio/lar/'s, very large form; 

 Liorfoynchu8 glohuliformis y Leptost/t'ophia perpkma, var. nervosa. I take 

 occasion t<> correct, with the help of added material, two identifications then 

 made, namely : Spirifer mesastriah's and Produetella cf. lachrymosa. The 

 former of these proves to be a varicose, narrow-winged shell of the <S". mucro- 

 nat%68 type, strikingly near the normal form of the species as it occurs in the 

 Hamilton group. Further notice will be taken of it presently. The other 

 species is a rather large form of Produddla speciom. 



