CONTENTS VI 1 



NUMBER VII. 



PAGE 

 A GROII' ok IIVI'OTHESES BEARING ON Cl.IMATIC CHANGES. T. C. 



Chamberlin ----------- 653 



An Analcite Basalt from Colorado. Whitman Cross - - - 684 



Studies on the So-called Porphyritic Gneiss of New Hampshire. 



Reginald Aldworth Daly --------- 694 



The Measurement of Faults. J. Edward Spun- ----- 723 



The Drift and Geologic Time. H. M. Bannister - . - - 730 



On the Presence of Problematic Fossil Medus.t^ in the Niagara 



Limestone of Northern Illinois. Stuart Weller - - - 744 



Editorial ------------- 752 



Reviews : The Unpublished Papers of the Geological Survey of Brazil 

 (Boletim do Musen Paraense), Vol. II, No. 2, 756; The Devonian 

 Fauna of the Reo Maecuru, by Dr. F. Katzer (review by John C. Bran- 

 ner), 757; Report of the United States Deep Waterways Commission, 

 James B. Angell, John F. Russell, Lyman E. Cooley (review by 

 F. L.), 758; The Former Extension of the Appalachians acict-s 

 Mississippi, L-ouisiana, and Texas, by Professor J. C. Branner (review 

 by A. H. Purdue), 759 ; Maryland Geological Survey, Vol. I, by William 

 Bullock Clark, State Geologist (review by R. D. S.) 760. - - - 756-761 



Recent Publications ---------- 761-766 



NUMBER VIII. 



The Geologic Relations of the Martinez Group of California 



AT the typical locality\ John C. Merriam - . . - 767 



Studies in the So-called Porphyritic Gneiss of New Hampshire. 



II. Reginald Aldworth Daly 776 



Supplementary Hypothesis Respecting the Origin of the Loess 



of the Mississippi Valley. T. C. Chamberlin - - - - 795 



Cryptodiscus, Hall. Stuart Weller ------- 803 



A Note on the M!(;ration of Divides. Wm. Sidney Tangier Smith - 809 



Discovery of Marine Jurassic Rocks in Southwestern Texas. ¥. 



W. Cragin ----------- 813 



Andendiorite in Japan. C. Iwasaki ------- 821 



SlUDIES IN THE DrIFTLESS REGION OF WISCONSIN. G. H. Squicr - 825 



Studiks for Students: The Method of Multiple Working Hypotlieses. 



r. C. Chamberlin ---------- 837 



Ediiokial .-.--------■ 849 



