502 Annals of the Carnegie Museum. 



2. Massive, pure limestone, gray, fine-grained, often oolitic, 

 abounding in crinoidal remains and Stenopo7-a fibrosa.^ 



20 feet. ■ 70 feet. 



3. Massive, bluish-black, tolerably pure nodular limestone, contain- 

 ing Maclii rites magniis and masses of black chert. 



45 feet. 1 15 feet, 



4. Similar to No. 3, but containing in addition to Maclurites 

 various species of Orthoceras and larger masses of Stro)natoceriiim. 



90 feet. 205 feet. 



5. Less massive limestones, cjuite impure, and often disintegrating 

 into nodules as though shaly. 



60 feet. 265 feet. 



A + B= 575 feet. 



(jrouj) C : Upper Chazy, 157 feet. 



1. Dark, iron-gray dolomite, weathering yellowish. 



1 foot. I foot. 



2. Blue, compact, fine-grained pure limestone, containing fine lines 

 of calcite. 



6 feet. 7 feet. 



3. Dove-colored, com])act, brittle, perfectly pure limestone, con- 

 taining small nodules of calcite. 



5 feet. 12 feet. 



4. Iron-gray dolomite. 



3 14 feet. 15 lo feet. 



5. Like No. 3, with larger calcite nodules. 



4i'o feet. 20 feet. 



6. Dark gray, fine-grained, compact limestone, somewhat impure, 

 having a mottled aspect when weathered, containing undetermined 

 species of Miircliisonia and Oiilioceras. 



2 feet. 22 feet. 



7. Iron-gray dolomite. 



I foot. 23 feet. 



8. Blackish, impure limestone, abounding in CtDiiarota'chia plena. 

 36 >< feet. 59 >^ feet. 



9. Gray, massive, coarsely granular limestone, mostly made up of 

 crinoidal fragments, which are sometimes red, containing Cainaro- 

 txchia. 



263^ feet. 86 feet. 



6 Alonotrypflla sp. 



