Volume XIII 



Number 3 



THE 



Journal of Geology 



A Semi-Quarterly Hagazine of Geology and 

 Related Sciences 



APRIL-MAY, 1905 



EDITORS 



T. C. CHAMBERLIN, in General Charge 



R. D. SALISBURY R. A. F. PENROSE, Jr. 



Geographic Geology Economic Geology 



J. P. IDDINGS C. R. VAN HISE 



Petrology Structural Geology 



STUART WELLER W. H. HOLMES 



Paleontologic Geology Anthropic Geology 



S. W. WILLISTON, Vertebrate Paleontology 



&fte aanibersttg of Chicago ^ress 



CHICAGO AND NEW YORK 



WnxuM Wesley & Son, London 



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