Prossee — Hamilton and Chemung Series. 



Interstratified with the shales are also thin, smooth sandstones. The rocks 

 probably belong in the Sherburne formation. 



On the first road turning to the east about one-fourth of a mile north of 

 the Andrews farm and eighty-five feet above the Hamilton shales at XIX D 1 , 

 are fine bluish, argillaceous shales which belong in the Sherbnrne formation. 

 These shales form the upper part of the northern end of the steep hill along 

 the Sherburne and Columbus township line. On the eastern side of the steep 

 hill, fossils were found about seventy feet below the exposure of the Sherburne 

 shales, just described, which are regarded as near the top of the Hamilton. 

 This outcrop is about 600 feet above the railroad level at Sherburne or approx- 

 imately 1,642 feet A. T. 



XIX JEJ 1 . In a bianch of Howard creek, at the foot of this hill, is a blue 

 sandstone, above which are coarse arenaceous shales. The outcrop is on the 

 Thomas Mulligan farm, three miles northwest of Columbus village, and is 155 

 feet lower than the stratum with fossils on the hillside, or approximately 1,487 

 feet A. T. The shales are blocky, split into irregular pieces, and contain 

 plenty of Hamilton fossils. The following species were collected : 



1. 



Troptdoleptus carinatus (Con.), Hall. 



(c) 







Orthis, sp. 



(rr) 



3. 



Spvrifer grcmulosm (Con.), Hall. 



(rr) 



4. 



() rthothetes Chermmgensis (Con.), H., var. arctostriata, H. (rr) 



5. 



Microdon ( Gyp Heard el J a) tenuistriatus, Hall. 



(rr) 



6. 



Pholadella radiata (Con.), Hall. 



(rr) 



7. 



Nucula bellistriata (Con.), Hall. 



(rr) 



8. 



Grammysia bimlcata (Con.), Hall. 



(rr) 



9. 



Grammysia cf. G. alveata (Con.), Hall. 



(rr) 



10. 



Coleolus tmuiemctum, Hall. 



(rr) 



11. 



Cyclonema multistriata, Hall (?). 





12. 



JOeptodesma, sp. 



(rr) 



XIX FK At the foot of a small glen one and two-tenths miles south- 



w est of the above exposure, are coarse arenaceous shales, containing plenty 

 of Hamilton fossils. Then, for about twenty feet, the rocks are covered, while 

 in the glen above is an excellent exposure of the Sherburne shales and sand- 

 stones (F 8 ). The glen is cut out of rocks belonging to this formation, and on 

 the road above, in front of Mr. Pultz's house, the thin argillaceous shales 

 are "well exposed. This locality is but a short distance east of the Sher- 

 burne and Columbus township line, and 150 feet of the Sherburne formation 

 are shown. 



