592 Annals of the Carnfxue IMusEU^[. 



In this paper Mr. Marcou gives the following sections at Chazy, evidently 

 following Emmon's ideas of 1842 and 1855. 



" In discordance on the Potsdam we see about 250 feet of Calciferous 

 sandrock, containing four or five species of fossils, such as Or(/iJs, Stro- 

 phomena, Scalites, and numerous fragments of crinoids. 



"Above it we have the Chazy limestone; about 200 feet in thickness, 

 containing a quantity of fossils, such as Maclurea magna, Bellerophon, Asa- 

 pkus, Stetiopoi a, Orthocaas, Rhynchonella, crinoid stems, etc. 



"Then comes the Birdseye limestone and Black River formation, called 

 also the Black Marble of Isle La Motte; thickness about 40 feet, containing 

 fossils belonging to holehts, Orthoce^-as, JMachirca, LepUcna, etc." 



1897. Whitfield, R. P. Description of New Species of Silurian Fossils from 



near Fort Cassin and Elsewhere on Lake Champlain. Bulletin of the 

 American Museum of Natural History, Vol. IX, pp. 177-184. 



Describes a new gastropod from the Chazy formation on Valcour Island. 



1898. Gushing, H. P. The Geology of Clinton County, New York. Report of 



the New York State Geologist, 1895, pp. 503-573. 



In this paper the Chazy outcrops in Clinton County are described and 

 mapped. The formation is divided into three divisions. A, B and C, fol- 

 lowing lirainerd and Seely. 

 1898. Ells, R. \V. Formations, Faults, and Folds of the Ottawa district (Can- 

 ada). Ottawa Naturalist, Vol. XI, pp. 177-189. 

 Not seen. 

 1S98. Merrill, F. J. H. A Guide to the Study of the (Jeological Collections of 

 the New York State Museum. Bulletin of the New York State Museum, 

 Vol. 4, No. 19. 



In this bulletin the Chazy is considered the lowest member of the Trenton 

 group. The thickness of the formation is given as 730 feet. The classifi- 

 cation used is as follows : 

 System. 



Lower Silurian. 



I. Calciferous. 



1899. Ami, H. M. Lists of Fossils. Appendix to Report J, \'ol. 12, 1899, Geo- 

 logical Survey of Canada, p. 139. 



Lists many fossils from localities in the Ottawa \'alley. Some of these 

 lists have been used in the preceding pages. 

 1899. Clarke, John M., and Schuchert, Charles. The Nomenclature of the 

 New York Series of Geological Formations. Science, new series, Vol. X, 

 pp. 874-878. 



The Chazy is put with the Beekmautown in the Canadian. 



