Raymond: Thk Chazy Formation and its Fauna. ~)2\ 



rhylloporiiia inccpta r, Camaroto^chia plena a, 



Monotrypella sp. c, Modiolopsis fahaforviis c, 



Rafinesqiiina distaiis c, Isotehis harrisi r, 



OrfJiiiiiuiii laiiieHosum r, Fferygometopi/s aniiiilatiis r. 



Cg. Thin-bedded gray layers capped by a heavy bed of pure bhie 

 limestone. 6 feet lo inches = 32 feet 6 inches. 



Z/>/^7//<? coliiDiba r, Isotelits harrisi c. 



Cainarofo-chia plena a, 



C . About 200 feet northeast of this last outcrop tliere is a little 

 point with rocks whose strike and dip are similar to the preceding. 

 The layers are of very hard magnesian limestone, fairly coarse-grained, 

 buff on the weathered surface and blue on a fresh fracture three or four 

 inches in from the surface. This layer is about thirty-five feet above Cg 

 and about ten feet below the Lowville limestone (C,,). A few frag- 

 mentary fossils were seen in this layer but the only identifiable one 

 was Eurvihilina lali//iari:;iiiala. 



For a little less than a hundred feet beyond this little point the 

 rocks are covered except at very low water. Brainerd and Seely, in 

 their section, mention a fine-grained sandstone as resting above the 

 tough magnesian limestone (C,^) but at ordinary low water it has not 

 been possible to locate this during the last five seasons. 



C„. Lowville limestone. About ten feet above the tough dolomitic 

 layers last described the pure buff dolomite typical of the " Birds- 

 eye " formation is encountered. It contains no fossils, but is full of 

 calcite lines similar to the Fliyfopsis. The thickness is at least four 

 feet, probably more, but not over ten feet at the most. 



C,.^. On the extreme end of the point is a pure-black limestone with 

 conchoidal fracture. The transition from the Lowville to the Black 

 River is here as abrupt and strongly marked as it is in the Moshier 

 Quarry at Newport in the Mohawk Valley. There is no line of bed- 

 ding between the two, but a sudden and complete change from laiffio 

 black on the line of contact. The Black River at this point is five 

 feet thick, and contains a few fossils. They are : 



Stroinatocerinin rugostini c, Leperditia fahnlites c, 



Strophomena incurvata r, Isotehis sp. r, 



Orthoceras sp. ind. r, Thaleops ovata r. 



