Rav.moxd : The Chazv Formation and its Fauna. 543 



Rafincsqiiina chaiiiplaineinis r, Ill(eiiiis !:;lohosus c, 



Zygospira acufirosfris c, Glapliunis pusiiilatiis R, 



Holopea sj). ind. r, Plioiiicrops canadensis r, 



Bucania sulcatina r, I.eperditia canadensis c. 



Beyond this outcrop there is very little rock exposed until the Black 

 River limestone is reached. i'he two outcrops which do occur are 

 the layers B. and C,.. of Brainerd and Seely's section. 



Section F, C/iazy, New York. 



This section begins at Kilns 6 and 7 of the Chazy Marble Time 

 Company, and extends east to the Black River limestone in R. S. 

 McCuUough's dooryard. It is about the line of Brainerd and Seely's 

 section IIL 



F|. Heavy-bedded, rather pure, fine-grained, dark-blue limestone, 

 which on the weathered surface is covered with a coarse network of 

 yellowish protruding lines, giving the rock the general appearance of 

 the fucoidal layers of the Beekmantown formation. The weathered 

 surface shows fragments of many fossils, but very few are obtained on 

 breaking the rock. 13 feet 9 inches =13 feet 9 inches. 



Rhinidictya fenestrata c, Plcesioniys platys r, 



Monotrypella sp. c, Rafinesquina chaniplainensis r, 



Faleocystites tenuiradiatns c, Isotelus sp. r, 



StrephocJietiis sp. c, Maclurifes niagnus r. 



F^. Two heavy beds of limestone similar to the preceding, but with- 

 out the yellow streaks on the weathered surface. These layers are full of 

 sponge-like forms, which show very distinctly on the weathered surface 

 and give the layers a mottled appearance. The fossils show on the 

 surface, but are difficult to extract. 



8 feet 6 inches =22 feet 3 inches. 



Faleocystites tenuiradiatns c, Orthoceras sp. c, 



Strcphochetiis sp. a, Cyr toe eras />oycii r. 



Maclurites niagnus c, 



F^. Impure blue magnesian limestone, which weathers down to a 

 shaly ma.ss full of nodules. Contains many yellowish streaks. Corals 

 and bryozoans numerous. 7 feet =29 feet 3 inches. 



F^. Heavy-bedded, impure black limestone, crowded with Mac- 

 lurites niagnus and Stroniatoceriuni. The fossils in these layers are 



