Pkosser — Hamilton and Chemung Series. 



131 



XIX P 6 . Above the Swan quarry is a steep hill with but few outcrops. 

 On the highway up this hill, at an elevation of 170 feet above the Swan 

 quarry, is a clear outcrop of the Sherburne flagstones, but these thin sand- 

 stones appear lower on the highway, and it is probable that the Swan quarry 

 is near the top of the Hamilton formation. 



XIX IP. Along a small run on the western side of the highway, near 

 the brow of the hill, are shales. This outcrop is barometrically 252 feet 

 above the base of the Swan quarry or approximately 1,567 feet A. T. Fossils 

 are rare with the exception of Liorhynclnts niesacostalis, Hall, fourteen speci- 

 mens of which were collected. The list is as follows: 



1. LiorJiynchus mesacostaMs, Hall. (a) 



2. Chonetes setigera, Hall (?). (it) 



Imperfectly preserved. 



3. JVucula corhidiformis, Hall (?). (it) 



Very imperfect specimen. 



4. Orinoid segments. (r) 



This outcrop probably contains the first of the Ithaca fauna, though it 

 is lower than its appearance in force, and below it are perhaps some 240 

 feet of shales and sandstones of the Sherburne formation. 



XIX G 1 . Section along a small stream and up a steep hill about three- 

 fourths of a mile southeast of Sherburne village and some twenty-five feet 

 above the railroad. In the stream are arenaceous blocky shales in which 

 Hamilton fossils are abundant, especially small Chonetes. 



XIX G 2 . About fifty-five feet higher, near the foot of the steep hill, 

 are coarser shales. The fossils are not so abundant as in Gr 1 , but the species 

 are larger, as for example, Spvrifer granulosus (Con.), Hall. 



XIX G 3 . Above comes the steep slope of the hill, completely covered 

 by soil to near the brow on the western side, 440 feet above Gr? where occurs a 

 ledge composed of coarse arenaceous shales alternating with thin blue flag- 

 stones. Some of the thin layers contain a few fossils, as Liorhynchii.s mesa- 

 CQStaUs, Hall ; Atrypa reticularis (Lin.), Dalm. ; Palmotieilo emarginata 

 (Con.), Hall; Paracyclas lirata (Con.), Hall; OrtMs, sp. ; Spvrtfer, sp., and 

 a few others. This ledge is in the lower part of the Ithaca formation and 

 barometrically 520 feet above the railroad, or at an approximate altitude of 

 1,582 feet A. T. 



XIX C 1 . One and one-half miles south of Sherburne village, Nigger 

 brook enters the Chenango river from the east. For two miles its course is 

 almost directly west, and it has cut a deep valley bordered by steep sides 



