TLhc journal of (Beolc-GE 



Published on or about the following dates: February i, March 15, May 1, June 15* 

 August 1, September 15, November 1, December 15. 



Vol. XIX CONTENTS FOR NOVEMBER-DECEMBER, 1911 



No. 8 



THE BEARINGS OF RADIOACTIVITY ON GEOLOGY -------- T. C. Chamberlin 673 



THE WING-FINGER OF PTERODACTYLS, WITH RESTORATION OF NYCTOSAURUS S. W. Williston 696 



THE TERRESTRIAL DEPOSITS OF OWENS VALLEY, CALIFORNIA - - - Arthur C. Trowbridge 706 



ON CORUNDUM-SYENITE (URALOSE) FROM MONTANA - ' - - - - - Austin F. Rogers 748 



A DRAWING-BOARD WITH REVOLVING DISK FOR STEREOGRAPHIC PROJECTION Albert Johannsen 752 



REVIEWS - - l - - 7s6 



The Journal of Geology is published semi-quarterly. TfThe subscription price is $3.00 per year; the 

 price of single copies is 50 cents, ^f Postage is prepaid by the publishers on all orders from the United States, 

 Mexico, Cuba, Porto Rico, Panama Canal Zone, Republic of Panama, Hawaiian Islands, Philippine Islands, 

 Guam, Tutuila (Samoa), Shanghai, \ Postage is charged extra as follows: For Canada, 30 cents on annual 

 subscriptions (total #3.30), on single copies, 4 cents (total 54 cents); for all other countries in the Postal 

 Union, 53 cents on annual subscriptions (total $3.53), on single copies, 11 cents (total 61 cents). ^Remit- 

 tances should be made payable to The University of Chicago Press and should be in Chicago or New York 

 exchange, postal or express money order. If local check is used, 10 cents should be added for collection. 



The following agents have been appointed and are authorized to quote the prices indicated: 



For the British Empire : The Cambridge University Press, Fetter Lane, London, E.C., and William 

 Wesley & Son, 28 Essex Street, Strand, London. Yearly subscriptions, including postage, 14J. 6d. each; 

 single copies, including postage, is. bd. each. 



For the continent of Europe : Th. Stauffer, Universitatsstrasse 26, Leipzig, Germany. Yearly sub- 

 scriptions, including postage, M. 14.80 each; single copies including postage, M. 2.66 each. 



For Japan and Korea: The Maruzen-Kabushiki-Kaisha, 11 to 16 Nihonbashi Tori Sanchome, 

 Tokyo, Japan. Yearly subscriptions, including postage, Yen 7.00 each; single copies, including 

 postage, Yen 1.25 each. 



Claims for missing numbers should be made within the month following the regular month of 

 publication. The publishers expect to supply missing numbers free only when they have been lost in 

 transit. 



Business correspondence should be addressed to The University of Chicago Press, Chicago, 111. 



Communications for the editors should be addressed to them at The University of Chicago, 

 Chicago, 111. 



Contributors are requested to write scientific and proper names with particular care and in citations 

 to follow the form shown in the pages of the Journal. 



Separates, if desired, must be ordered in advance of publication. Separates of leading articles will be 

 printed as ordered, of which 50 (without covers) will be furnished gratis, the actual cost of the remainder 

 (and covers, if desired) to be paid for by the author. The table below shows the approximate cost of 

 separates consisting of plain text or text with line engravings. The actual cost may vary from the figures 

 given, and will depend upon the amount of work in re-making the pages into forms, press work, paper, 

 binding, etc. Separates containing half-tones may be expected to cost somewhat more than the rates 

 given, the increase depending upon the number of cuts and the amount of work required upon them. 



Entered March 20, 1893, at the Post-Office at Chicago, 111., as -second -class matter, under Act of Congress, March 3, 1879. 



