BEEKMANTOWN AND CHAZY FORMATIONS OF CHAMPLAIN BASIN 527 



of the Champlain basin and Mississippian sea. Here the lack of 

 knowledge of organisms from the latter is the chief obstacle to a 

 positive conclusion, but the few cephalopods obtained from the west 

 point all to but one inference, namely that of a closer connection of 

 these marine expanses. 



The presence of the genera Nanno and Gonioceras which in the 

 Champlain basin are restricted to the Chazy, in the next formation, 

 the Lowville limestone in the Mississippian sea would, combined 

 with the fact that the Lowville limestone is not present in the Cham- 

 plain basin, suggest that these genera may have existed before Low- 

 ville time in the Mississippian sea and persisted there into that 

 period, thus indicating a connection before Lowville time. This 

 inference receives strong support from the occurrence of Gonio- 

 ceras in China, in the far western part of the Pacific-American 

 basin, of Eurysto mites kelloggi, and of two species of 

 Piloceras in the small known fauna of the Shakopee formation. 



BIBLIOGRAPHY 



1847 Hall, J. Palaeontology of New York. v. i. 



1857 Billings, E. Report of Progress for 1856. p. 306. 



1859 Fossils of the Chazy Limestone, with Descriptions of New 



Species. Can. Nat. & Geol. 4:426 ft". 

 1859 Fossils of the Calciferous Sandrock Including Those of a 



Deposit of White Limestone at Mingan, Supposed to Belong to 



the Formation. Geol. Sur. Can. Rep. for 1858-59 and Can Nat. 



& Geol. 1859. 4:345. 

 1861 Hall, J. Report on Progress of Geological Survey of Wisconsin 



p. 38 ff. 

 1865 Billings, E. Palaeozoic Fossils. Geol. Sur. Can. v. i. 

 1881-85 Zittel, K. A. Handbuch der PaL-eontologie. Bd. IL 

 1884 Dwight, W. B. Recent Explorations in the Wappinger Valley 



Limestone of Dutchess County, N. Y. Am. Jour. Sci. Ser. 3. 



27:250-58, pi. 7. 

 1886 Whitfield, R. P. Notice of Geological Investigations along the 



Eastern Shore of Lake Champlain, etc.. Conducted by Prof. 



H. M. Seely and Pres. Ezra Brainerd with Descriptions of the 



New Fossils Discovered. Am. Mus. Nat. Hist. Bui. v. i, no. 8. 



p. 293-345. 

 1888 Foord, A. H. Catalogue of the Fossil Cephalopoda in the British 



Museum. 1888. pt. i. 1891. pt. 2. 



1888 Brainerd, E. and Seely, H. M. The Original Chazy Rocks. Am. 



Geol. v. 2, no. 5. 



1889 Remele, A. Beschreibung und Abbildung einiger gekrlimmter Cephalo- 



poden. Festschr. der Forstak. Eberswalde. 

 1889 Miller, S. A. North American Geology and Paleontology. 



