BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 VOL. 3, PP. 1-152, FRONTISPIECE, PLS. 1, 2 MARCH 9, 1892 



PROCEEDINGS OF THE SUMMER MEETING, HELD AT 

 WASHINGTON, AUGUST 24 AND 25, 1891. 



H. L. Fairchild, Secretary. 



CONTENTS. 



Page. 



Session of Monday Morning, August 24 2 



Election of Fellows 2 



Memorial Sketch of Alexander Winchell 3 



A geological Map of South America (abstract) ; by Gustav Steinmann 13 



On the Permian, Triassic, and Jurassic Formations in the East Indian 



Archipelago (discussion by C. A. White and L. F. Ward); by August 



Rothpletz 14 



Thermometamorphism in igneous Rocks ; by Alfred Harker 1(> 



Afternoon Session, August 24 23 



Tin- Plant-bearing Deposits of the American Trias ; by Lester F. Ward . . . 23 



Studies in problematic Organisms — the Genus Scoliihus ; by J. F. James . . 32 



The Tertiary Iron Ores of Arkansas and Texas ; by R. A. F. Penrose, Jr. . 44 



Sandstone Dikes in northwestern Nebraska ; by Robert Hay 50 



Evening Session of Monday, August 24 .1.") 



Session of Tuesday Morning, August 25 56 



Eulogium of Alexander Winchell .">(> 



The Eurypterus Beds of Oesel as compared with those of North America 



(abstract) ; by Friedrich Schmidt 59 



On the marine Beds closing the Jurassic and opening the Cretaceous, with 



the History of their Fauna ; by Alexis Pavlow (il 



Quaternary Changes of Level in Scandinavia ; by Gerard de < reer 65 



The "Black Earth" of the Steppes of southern Russia; by A. \. Krassnof. 68 



< )n the Existence of the Dinotherium in Roumania ; by ( fregoire Stefanescu . 8 1 



Afternoon Session, Tuesday, August 25 83 



The Elseolite-Syenite of Beemerville, New Jersey (abstract); by J. F. Kemp. 83 



Notes on the Texas-New .Mexican Region ; by Robert T. Hill 85 



The Relation of the American and European echinoid Faunas; by John 



W. Gregory 101 



The Missouri Coal Measures and the Conditions of their Deposition; by 



Arthur Winslow L09 



The I 'el vis of a Megalonyx and other I Jones from Big Bone Cave, Tennessee ; 



by .lames M. Safford L21 



The * !ienegas of southern ( lalifornia ; by E. W 1 [ilgard 121 



The < lhattahoochee Embaymenl ; by Lawrence ( '. Johnson L28 



L— Bi ii. Geol. 8oc, Am., Vol. 3, 1891. 



