CONTENTS 5 



Page 

 Recent eruption of Lassen Peak [abstract] ; by A. L. Day and 



E. T. Allen 141 



Surface fusion of lava ; by J. S. Diller 142 



A source of heat in volcanic activity [abstract and discussion] ; 



by Lea son H. Adams Ill 



Use of foraminifera in determining underground structure, espe- 

 cially in petroleum mining [abstract] ; by J. A. Cusbman 145 



Session of Friday afternoon 146 



Titles and abstracts of papers presented at the afternoon session and 



discussions thereon 146 



Deccan traps and other plateau basalts [abstract] ; by Henry S. 



Washington 146 



Geology of the Guilford, Connecticut, quadrangle [abstract and 



discussion] ; by Wilbur G. Foye 147 



Jasperoid of the Joplin district, Missouri, Kansas, and Oklahoma 



[abstract] ; by W. S. Tangier Smith 147 



Transitional coals and their bearing on hypothesis of the origin 



of coals [abstract] ; by Edward C. Jeffrey 148 



Organization of Pennsylvania anthracite and the peat hypothesis 



of the origin of coal [abstract and discussion] ; by Edward C. 



Jeffrey 149 



Ore deposits of Leadville, Colorado [abstract] ; by G. F. Loughlin 149 

 Antimony mines of Shiu Chow, China [abstract] ; by George D. 



Hubbard 149 



Source of the sulphates in the Salina beds [abstract] ; by David 



H. Newland , . . 150 



Flooding of oil wells by fresh water [abstract] ; by Thomas 0. 



Brown 151 



Sectional session of Friday afternoon 151 



Titles and abstracts of papers presented at the afternoon session and 



discussions thereon .* 151 



Oriskany of Oklahoma [abstract and discussion] ; by Charles 



Schuchert 151 



Age of the Talladega phyllite [abstract] ; by William F. Prouty.. 151 

 Constitution of the Ohio black shales [abstract and discussion] ; 



by George H. Chadwick 152 



Volcanic ash bed in the Ordovician of Tennessee, Kentucky, and 



Alabama [abstract and discussion]; by Wilbur A. Nelson 152 



Strata near Stuart, Iowa [abstract]; by John L. Tilton 153 



Environment of the early Permian insects of Kansas [abstract 



and discussion] ; by Carl O. Dunbar 153 



Some cavern deposits in the Permian in west Texas ; by J, A. 



Udden 15.°, 



Paleozoic-Mesozoic contact throughout Wyoming [abstract]; by 



S. H. Knight 155 * 



Stratigraphy of the Lower Oreodon beds of the South Dakota P>ig 



Badlands [abstract and discussion] ; by William J. Sinclair. ., . 155 



