xii F 2 . KEPOKT OF PROGRESS. E. W. CLAYPOLE. 



The Medina sandstone No. IV seems to be barren of fos- 

 sils ; a few unidentified forms were obtained from the north 

 slope of Conococheagae mountain. 



The Clinton lower green shale of No. V has proved to 

 be very barren ; only a few not yet studied forms were 

 found in it. The Iron sandstone is occasionally very f os- 

 siferous, yielding Beyrichia lata and Calymene clintoni. 

 In this occur traces of the earliest vertebrate yet recognized 

 in America: a spine * named by Prof. Claypole Onchus 

 clintoni; broken and comminuted scales and plates; and 

 small pellets, apparently coprolites. The Upper green 

 shale has yielded Beyrichia lata, Calymene clintoni, and 

 Calymene niagarensis. The Ore sandrock and Sand vein 

 ore bed are often abundantly fossiliferous, but the forms 

 are badly preserved : Beyrichia lata, Calymene clintoni, 

 Ormoceras vertebratum. The limestone and shale beds 

 above the sandrock are not fruitful of the Clinton forms, 

 among which appears Lingula oblonga. 



The Onondaga red shale of No. V has yielded few fossils, 

 Leper ditia alta being almost alone ; but comminuted scales, 

 probably of fish, were found at a few localities. The Yar 'le- 

 gated shale is almost equally barren ; but Leperditia alta 

 is very abundant in the beds near the top ; and the very 

 highest beds {Bloomfield sandstone) are made peculiarly 

 interesting by Prof. Claypole 1 s discovery in them of the 

 shields of two kinds of hsh, which he has named Palw- 

 aspis americana and Palwaspis bitruncata, and spines of 

 small size, with fluted surfaces like those of SalachianorSilu- 

 roid fish, which he names Onchus pennsylvanicus.\ In the 

 Water -lime group, Leperditia alta, often of unusually 

 large size, is the only fossil form abundant in Perry county; 

 but a good specimen of Pterygotus osborni was obtained 

 from Juniata county through Mr. James Stevenson, now of 

 Akron, < >hio. 



The Lower Helderberg formation No. VI is very fossil- 



* Described in advance in the Quarterly Journal of the Geological Society 

 Of London. Meeting December 14, 1884. 



t For a preliminary description and remarks, see American Naturalist, p. 

 1222, December, 1884. 





