STRUCTURE OF THE SANTA CRUZ RANGE 657 



The scientific program was then taken up and the following papers 

 were presented and discussed : 



NOTES ON THE STRUCTURE OF THE SANTA CRUZ RANGE, CALIFORNIA 



BY J. F. NEWSOM 



[Ahstractl 



The major fault Hues of the range have northwest-southeast directions vary- 

 ing from north 20° west to north 45° west. Various movements have occurred 

 along the major fault lines. Movement along some of the major lines has 

 probably been to some extent lateral. 



A secondary system of faults lying at angles of from north 60° west to 

 north 75° west also occurs. These are reversed faults and are parallel with 

 the principal axes of folding in the range. 



The folds and secondary faults were probably formed by lateral movement 

 and consequent crushing along the major fault lines. 



NOTES ON THE TOPOGRAPHY OF THE SEWARD PENINSULA, ALASKA 



BY J. r. NEWSOM 



[Abstract] , 



The accumulation of ice, with its protective influence, has been an important 

 factor in foi-mlng the rounded dome-like topography of the Seward peninsula. 

 The protective influence of moss is also an important factor. In many places 

 where small spots are free from moss, but surrounded by it, hogwallows are 

 formed. Considerable hillocks are occasionally developed in old filled pond 

 basins by the squeezing action of the freezing sands and gravels pushing up 

 the unfrozen materials from below. 



OCCURRENCE OF MIDDLE TERTIARY MAMMAL-BEARING BEDS IN NORTH- 

 WESTERN NEVADA 



BY JOHN C. MERRIAM 



This paper was published in Science, new series, volume xxvi, 1907, 

 pages 380-382. 



The meeting then adjourned for the noon recess. 



The afternoon session began at 2.00 p m and the first paper was read 

 by title : 



NOTES ON SOME CALIFORNIA MINERALS 

 BY AUSTIN r. ROGERS 



The following papers were then read and discussed: 



TRANSPORTATION OF DETRITUS BY YUBA RIVER* 

 BY G. K. GILBERT 



[Abstract] 



In the process by which running water transports detritus two factors are 

 distinguished. The larger particles are rolled along the bottom, or else lifted 

 • Published by permission of the Director of the U. S. Geological Survey. 



