Raymond : The Chazy Formation and its Fauna. T)*)! 



The Chazy formation in these townships is rather heavy-bedded and the 



layers are much used as a building stone. The following fossils, identified 

 by Gilbert Van Ingen, are listed : 



Maclurea magna, ? Or/his pe)~<eta, 



Orthoceras sp., Orthis platys, 



f Alonticulipora lycopodites, Strophomena incrassata, 



Orthis borealis, Strophomena alternata, 



Orthis imperator, Solenopora compacta, 



P Orthis cost a lis, Stenopora fibrosa, 



? Ophileta complanata, Asaphus sp. ? fragments, 



Litiiites sp. ? Trilobite, fragments, 



Bolboporites americanus, Zaphretitis, 



Camarella varians, Encrinal columns. 

 CaviareHa sp. 



Globular masses containing as nuclei minute lamellar foraminiferal skele- 

 tons. 



1S97. Ke.mp, J. F". The Geology of Moriah and Westport Townships, Essex 

 County, New York, with a Geologic Map. 48th Annual Report New York 

 State Museum, Vol. I, Appendix, pp. 325-355. 



1S97. Kemp, J. F. Physiography of the Eastern Adirondacks in the Cambrian and 

 Ordovician Periods. Bulletin of the Geological Society of America, Vol. 8, 

 p. 40S. 



In this paper Professor Kemp brings together all possible evidence of the 

 physiography of what he calls the Adirondack Island of early Paleozoic 

 times. The following are the most interesting statements. 



" It is evident that the Lower and Middle Cambrian strata were laid down 

 well to the east of the present limits of the crystallines and that with their 

 gradual subsidence the Cambrian sea crept w^estward, so that the Potsdam 

 sandstones were deposited along an encroaching shore line." 



Continuing, the writer describes many valleys and depressions in which 

 the strata are Potsdam or Beekmantown, while the crystallines rise high 

 above them. He considers these to be prepaleozoic depressions which were 

 occupied by arms of the sea during the paleozoic. Some outliers twelve to 

 twenty miles from the lake show the former extent of these depressions. In 

 the depressions on the southern and southeastern sides the Trenton extends 

 further into the mountains than the other formations. 



As an alternative hypothesis, Kemp says it is necessary to assume that the 

 Adirondack region was a peneplain in later Cambrian time and the Cambrian 

 and Ordovician sea spread over it. All rocks then deposited must have been 

 removed except these small remnants which have been drojjped by great 

 faults and so preserved in the fault valleys. Although the faults are rec- 

 ognized as strong factors in the topography, the embayment theory seems 

 to him more probable. 

 1897. M.\RCOU, Jules. Rules and Misrules in Stratigraphic Classification. Ameri- 

 can Geologist, Vol. 19, pp. 35-49, 111-131. 



