Pkosser — Hamilton and Chemung Series. 



North Norwich. 



XL J 1 . The next township south of Sherburne is North Norw ich, in 

 tlie northwestern portion of which is a steep and high hill, know n Locally as 

 Pratt's mountain. On its eastern side is the Chenango river, and on the 

 western the Fly brook valley, which is follow ed by the Delaw are, Lackaw anna 

 and AYestern railroad from the North Norwich station to Sherburne village. 

 On the eastern side of the hill, two and four-tenths miles south of Sherburne, 

 and immediately above the lock on the abandoned Chenango valley canal, are 

 rather cbarse, arenaceous shales in which Hamilton fossils are common. This 

 exposure is about on a level with the station in Sherburne. 



XL A~. This part of the hill side is very steep, and near its top, 

 345 feet above the canal, is a ledge composed of thin arenaceous shales 

 alternating with thin sandstones, an inch or more in thickness. Fossils are 

 very rare, only a few specimens of LiorhynxLhus, being found. The outcrop is 

 probably in the Sherburne formation, although not far from the base of the 

 Ithaca, and it has an approximate altitude of 1,387 feet A. T. 



XL LP. The southern end of Pratt's mountain is about one-half mile 

 north of the village of North Norwich, and near the brow of the hill are 

 coarse, arenaceous shales that split into thin, somewhat even pieces. Fossils 

 are,. very rare, an occasional TAorhynclius and Spirifer with fragments of plant 

 stems constituting all that were found. This is probably the base of the 

 Ithaca formation. The New York, Ontario and Western railroad station at 

 North Norwich is 1,005 feet A. T., but probable inaccuracy in the readings of 

 the barometer on account of rain gave this ledge as 265 feet higher than the 

 station, which would indicate an altitude of 1,270 feet A. T. 



XLj C 1 . Along Cold brook, about one mile southwest of North Norw ich, 

 are bluish arenaceous shales that split into regular pieces of uniform thick- 

 ness. No fossils were found except fragments of plant steins. The first 

 exposure of these shales was at eighty-five feet above the station, and they 

 continue w ith practically the same characters for 153 feet and belong in the 

 Sherburne formation. 



XLj i . Along a small stream that enters Cold brook from the west are 

 rocky cliffs, and at an elevation of 153 feet above the railroad, or approxi- 

 mately 1,15s feet A. T., is a, layer, about two inches thick, containing fossils, 

 mostly brachiopods, as Liorli/ynchus mesacostalis, Hall ; Spirifer mesastrictlis, 

 Hall (?) ; Spirifer rrmcronatus (Con,), Bill. (Ithaca variety) ; Oyrtina Ha/mil- 

 tonensis, Hall; Nueula sp. and Crinoid stems. This exposure is clearly the 

 first of the Ithaca fauna, and may be considered the base of the Ithaca forma- 



