544 Anxals of the Carnegie Museum. 



partiall}' siliciTied and the weathered svirface })resents thousands of 

 sj^ecimens of Alacliirites magnus. Top of the first ledge. 



7 feet 9 inches =37 feet. 



F^. Covered. 19 feet = 56 feet. 



Fg. Gray, shaly magnesian limestone, which weathers readily into a 

 nodular mass. Fossils few. 11 feet = 67 feet. 



Mouoti-ypella sp. c, Afacliirites magmis r. 



Camerella lougirostris r, 



F^. Covered. 42 feet = 109 feet. 



Fg. Light gray, fine-grained dolomite. Weathers light yellow. Xo 

 fossils except Leperditia canadensis. 



8 feet 6 inches =117 feet 6 inches. 



Fg. Almost black, fine-grained dolomite, breaking with conchoidal 

 fracture. These layers contain many spots of calcite like the "birds- 

 eyes" of the Lowville limestone. F^ to F,j was the Birdseye lime- 

 stone of Emmons, 1842. The only fossils in F^ are a few specimens 

 of Leperditia canadensis and an Orflioceras. 



5 feet =122 feet 6 inches. 



Fjg. Light gray, fine-grained dolomite which weathers to a yellowish 

 brown. No fossils. 5 feet =127 feet 6 inches. 



Fj,. Like Fg, but with more calcite. 5 feet 6 inches =133 feet. 



Fjj. Dark gray dolomitic limestone, packed full of bryozoans and 

 sponge-like forms. 3 feet = 136 feet. 



StrepJiochetus sp. c, LopJiospira siibahbre^nata c, 



Bticania sulcatina r, Leperditia limatula r. 



Fjg. About the same as the preceding, but without the bryozoa. 



1 foot = 137 feet. 

 This is about the same as the top of C^ of Brainerd and Seely's sec- 

 tion. For photograph of the outcrop of layers Fg-F,^, see Plate XXIV. 



F,^. Covered. 16 feet =153 feet. 



Fjj.. Impure, rather shaly limestone, with a few fossils. 



2 feet ^155 feet. 



Het'ertei/a c'u/garis r, Leperditia canadensis c. 



Camaroteccliia plena r, 



F,g. Covered. 20 feet ^175 feet. 



F|.. Light-gray, coarse-grained limestone, with many fragments of 



fossils. 2 feet ^177 feet. 



