CONTENTS. 



Page 



Proceedings of the Summer Meeting; held at Washington, August 24 and 25, 



1891 ; H. L. Fairchild, Secretary 1 



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 Gtjstav Stein- 



mann 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 16 



Afternoon Session, August 24 23 



The Plant-bearing Deposits of the American Trias; by Lester F. 



Ward 23 



Studies in problematic Organisms — the Genus Scolithus; by J. F. 



James 32 



The Tertiary Iron Ores of Arkansas and Texas ; by R. A. F. Pen- 

 rose, Jr 44 



Sandstone Dikes in northwestern Nebraska ; by Robert Hay 50 



Evening Session of Monday, August 24 55 



Session of Tuesday Morning, August 25 56 



Eulogium of Alexander Winchell 56 



The Eurypterus Beds of Oesel as compared with those of North 



America (abstract) ; by Friedricii Schmidt 59 



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



with the History of their Fauna ; by Alexis Pavlow 61 



Quaternary Changes of Level in Scandinavia ; by < Jrrard de ( !eer. 65 

 The " Black Earth " of the Steppes of southern Russia ; by A. N. 



Krassnof 68 



On the Existence of the Dinotherium in Roumania; by Gregoire 



Stefanesctj 81 



Afternoon Session, Tuesday, August 25 83 



The Eleolite-Syenite of BeemerviUe, New Jersey (abstract); by J. 



F. Kemp 83 



Notes on the Texas-New Mexican Region ; by R. T. Iln.i 85 



The Relation of the American and European echinoid Faunas; by 



J. W. Gregory 101 



The Missouri Coal Measures and the Conditions of their Deposition; 



by Arthur Winslow 109 



The Pelvis of a Megalonyx and other Bones from Big Bone Cave, 



Tennessee ; by J AMES M. S AFFORD 121 



The ( lienegas of southern ( ialifornia ; by E. W Hilgard 124 



The Chattahoochee Embaymenl ; by L. C. Johnson L28 



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