CONTENTS. y 



page. 

 Session of Saturday, December 28 550 



Geological and Petrographical Observations in Southern and Western 



Norway (abstract); by George H. Williams 551 



Cretaceous Plants from Martha's Vineyard (abstract); by David 



White 554 



Significance of Oval Granitoid Areas in the Lower Lauren tian 



(abstract); by C. II. Hitchcock 557 



Porphyritic and Gneissoid Granites in Massachusetts (abstract) ; by 



B. K. Emerson 559 



On the Intrusive Origin of the Watchung Traps of New Jersey 



(abstract); by Frank L. Nason 502 



The Fiords and Great Lake Basins of North America considered as 



Evidence of Preglacial Continental Elevation and of Depression 



during the Glacial Period ; by Warren Upiiam 5'):; 



On the Genus Spirifera and its Interrelations with the Genera Spi- 



rifcrina, Syringothyris, Oyrtia, and Cyrtina (synopsis) ; by James 



Hall 507 



On Pot-IIolcs North of Lake Superior unconnected with existing 



Streams; by Peter McKellar 508 



Constitution and By-Laws of the Geological Society of America 571 



List of Officers and Fellows of the Geological Society of America 570 



Index to volume 1 587 



ILLUSTRATIONS. 



r Ancient Bowlder Pavement of Algonquin Beach ) 



Plate 1— Si'ENCER: . 80 



I. Modern Bowlder Pavement on Georgian Bay ) 



" 2— Russeil: Sketch Map of Alaska 99 



" 3 — Davis: A Representative Glacial Sand Plain 2U2 



" 4 — VanHise: Sections of Micaceous Graywacke in ordinary and polar- 

 ized Light (2 figures) 211 



" 5 " Sections of Mica-slate and Museovite-biotite-schist (2 



figures) 211 



« 6— Diller: Sandstone Dikes in Northern California (4 figures) III 



" 7 " Sandstone Dikes in Northern California (3 figures) 416 



" 8 " Great Sandstone Dike on Roaring River 418 



u 9— Shaler: Geological Sections on Martha's Vineyard (3 figures) 152 



» 10— Ells: Map of Quebec, Levis, and Island of Orleans — 164 



<' 11 — Williams: Oscillations in Devonian Sedimentation (11 figures) 487 



u 12 " Representative Fossils of the Cuboides Zone (16 figures) •"><»> 

 n 13 " Geographical Modifications of Atrypa cuboides, Sow. (34 



figures) r '"" 



