138 BULLETIN OF THE 



Claypole, E. W. 



Oil the Pre-Glacial Geography of the Region of the Great Lakes. Canadian 



Nat. and Geol., 1878, (2,) viii. 187-206. 

 Pre-Glacial Formation of the Beds of the Great American Lakes. Canadian 



Nat. and Geol., 1879, ix. 213-227. 

 Clinton, De Witt. 



On Certain Piieuomena of the Great Lakes of America. Trans. New York 



Lit. and Pliil. Soc, ii.. Part I. 1-33. 

 Cordier, Louis. 



Note sur une Masse de Cuivre natif provenant des E-ives du Lac Superienr, aux 



Etats-Unis d'Anierique. Louis Cordier and Elie de Beaumont. Comptes 



Rendus, 1819, xxviii. 161 - 163 ; Loonhard's Jahrbuch, 1819, p. 470. 

 Courtis, W. M. 



The North Shore of Lake Superior as a Mineral-bearing District. Trans. 



Am. Inst. Min. Eng., 1877, v. 473-487- 

 Credner, Hermann. 



Die Gliedcruiig dcr eozoischen (vorsilurischen) Formationsgruppe Nord- 



Amerikas. Zeits. Gesam. Naturwiss., Giebel, 1868, xxxii. 353-405. 

 Beschreibung eiuiger cliarakteristischer Vorkommen des gediegenen Kupfers 



auf Keweenaw Point am Obereus See Nord-Amerika's. Leonhard's Jahr- 

 buch, 1869, 1-14. 

 Die vorsilurisclieu Gebilde der " Obern Halbinsel von Michigan " in Nord- 



Amerika. Zeit. Deut. Geol. Gesell., 1869, xxi. 516-554. 

 Gewaltige Kupfermassen am Lake Superior. Leonhard's Jahrbuch, 1870, 86. 

 Ueber nordamerikanische Scliieferporphyroide. Leonhard's Jahrbuch, 1870, 



970-984. 

 Elemente der Geologic. *lst ed. 1872, *2d ed. 1872, 3d ed. 1876, 699 pp., 



*4th ed. 1880. 



Crosby, William O. 



On a Possible Origin of Petroslliceous Rocks. Proc. Bost. Soc. Nat. Hist., 



1879, XX. 160-169. 

 Contributions to the Geology of Eastern Massachusetts. Occasional Papers 



of the Bost. Soc. Nat. Hist., 1880, iii. 286 pp., with map. 



Cunningham, Walter. 



Report of Walter Cunningham, late Mineral Agent on Lake Superior. Jan. 

 8, 1845. Seuate Docs., 2Sth Cong. 2d Sess., 1844-45, vii.. No. 98, 

 5 pp. 



Dana, James D. 



System of Mineralogy. 1st ed.. New Haven, 1837, 671 pp. ; 2d ed.. New 

 York, 1844, 633 pp.; 3d ed., New York, 1850, 711 pp.; 4th ed.. New 

 York, 1854, 853 pp. ; 5th ed.. New York, 1868, 827 pp. 



Manual of Mineralogy. New Haven, 1857, 456 pp. 



Review of Marcou's " Geology of North America." Am. Jour. Sci., (2,) 

 1858, xxvi. 323 -333. 



