("OX TEXTS 8 



Page 

 Primary chalcocite in tlie fluur.spar veins of Jefferson Comity, 



Colorado [abstract] ; by Horace B. Patton 84 



Recent remarkable gold "strike" at the Cresson INIine. Cripiile 



Creek, Colorado [abstract and discussion] : by Horace P>. Patton S4 

 I'latinum-gold lode deposit in southern Nevada [abstract] : by 



Adolph Knopf 85 



Organic origin of some mineral deposits in unaltered Paleozoic 



sediments [abstract and discussion]; by Gilbert van Ingen.... 85 

 Isostasy and radioactivity; Presidential address by George F. 



Beclver S(i 



Session of Wednesday. I )ecember 30 87 



Report of Auditing Committee 87 



Titles and abstracts of papers presented in general session and dis- 

 cussions tliereon 87 



Revision of pre-Cambrian classification in Ontario [alistract and 



discussion] ; by Willet G. Miller and Cyril W. Knight 87 



North American continent in Upper Devonic time [abstract and 



discussion] ; by Amadeus W. Grabau 88 



Symposium on the passage from the Jurassic to the ('retaccons '.)() 



Titles and abstracts of papers presented before the First Section and 



discussions thereon !<() 



Type of rifted relict mountain, or rift mountain |ai>strMcl and dis- 

 cussion 1 ; by John M. Clarke no 



lOvidence of recent subsidence on the coast of Maine | abstract and 



discussion] ; by Charles A. Davis !)1 



Basic rocks of Rhode Island: their correlation and relationshi]>s 



[abstract and discussion] ; by A. C. Hawkins and C. AV. P.rov>n. 9i' 

 Acadian Triassic [abstract and discussion] ; by Sidney Powers... t>:; 

 (Jeological hi.story of the Bay of Fundy [al)stract] ; liy Sidney 



I 'owers 04 



Tides and al)stracts of papers presented before the Second Section. . . 05 

 Alexandrian rocks of northeastern Illinois and eastern Wiscon- 

 sin [abstract] ; by T. E. Savage 95 



Olentangy shale and associated deposits of northern oliio |ab- 



stract] ; by (Minton P. Stauffer 05 



Diastrophic importance of the unconformity at tlu' base of the 



Berea sandstone in Ohio [abstract 1: by H. P. Cushing 90 



Kinderhookian age of the Chattanoogan series [abstract] : by 



K. <). TTlrich 9.; 



'I'itles and abstracts of jiajiers i)resente(l before the Third Section and 



di.scussions thereon 99 



()rigin of the iron ores ;it Kinnia. Sweden labstractj; by Regi- 

 nald it. Oaly 90 



(digin of the iiocky Moinitain iiliosphate deposits iabstract]; by 



Kliot P.lMckwelder 190 



Regional alteration of oil shales |,Mbstract|: by l»a\id White 101 



()il pools of southern ( >Ul;iboin;i and Tiortbein 'i"e.\as (absti'actl: 



by James II. (Jardiier 19L' 



Natural gas at Cleveland, <»liio |abs|racl | : by Kraiik K. \':in Horn KVJ 



