Vlll BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 



Some structural features in the northern anthracite coal field [ab- 

 stract] ; by N. H. Darton 676 



Geothermal data of the United States [abstract] ; by N. H. Darton. . 677 



Magnitude of continental deposits [abstract] ; by Charles R. Keyes.. 677 



Glacial cirques near Mount Washington [abstract and discussion] ; by 

 James Walter Goldthwait. 677 



Geological section along the Yukon-Alaska boundary between Yukon 

 and Porcupine rivers [abstract] ; by D. D. Cairnes 678 



Red Beds between Wichita Falls, Texas, and Las Vegas, New Mexico, 

 in relation to their vertebrate fauna [abstract] ; by E. C. Case 679 



Shinarump conglomerate [abstract and discussion] ; by Herbert E. 

 Gregory 679 



Further discoveries in the Taconic Mountains [abstract] ; by Arthur 

 Keith 680 



Preliminary geological map of the. Navajo-Moki Reservation [ab- 

 stract] ; by Herbert E. Gregory 680 



Various forms of silica and their mutual relations [abstract] ; by 

 Clarence N. Fenner 681 



Index-ellipsoid in petrographic-microscopic work [abstract and discus- 

 sion] ; by Fred E. Wright 681 



Igneous complex of high titanium-phosphorus-bearing rocks of Am- 

 herst-Xelson counties, Virginia [abstract] ; by Thomas L. Watson 

 and Stephen Taber 682 



Petrology of a series of nepheline syenite, camptonite, monchiquite, 

 and diabase dikes in Middle Shenandoah Valley, Virginia [ab- 

 stract] ; by Thomas L. Watson and Justus H. Cline 682 



Northumberland volcanic plug [discussion] ; by H. P. Cushing 683 



Lavas of Hawaii and their relations [abstract] ; by Whitman Cross. . 684 



Production of apparent diorite by metamorphism [abstract] ; • by 

 Arthur Keith 684 



Media of high refraction and some standard media of lower refraction 

 for the determination of refractive indices with the microscope [ab- 

 stract] ; by H. E. Merwin 683 



Certain so-called meteoric irons of Canyon Diablo [abstract] ; by 

 Charles R. Keyes 685 



New occurrence of monazite in North Carolina [abstract] ; by Joseph 

 Hyde Pratt 686 



New occurrence of pisanite and some large staurolites from Ducktown, 

 Tennessee [abstract] ; by Frank R. Van Horn 686 



Speculative nature of geology [abstract] ; by W. M. Davis 686 



Bearing of recent climatic investigations on geological theories [ab- 

 stract and discussion] ; by Ellsworth Huntington 687 



Piedmont terraces of the northern Appalachians and their mode of 

 origin [abstract and discussion] ; by Joseph Barrell 688 



Post- Jurassic history of the northern Appalachians [abstract and dis- 

 cussion] ; by Joseph Barrell 690 



Recent changes in the Asulkan Glacier [abstract] ; by Heinrich Ries. 696 



Evidence of very early glaciation in Ohio [abstract] ; by George D. 

 Hubbard 696 



Beginnings of Lake Agassiz [abstract] ; by Frank Leverett. . , 697 



