INDEX TO VOLUME 18. 



, „ Page 



ABEfzzr and Bi-yant, cited on condition 



of marine glacier 27S 



ACCESSION'S to Library, List of . . . 671-6S0 

 ADAMS. F. D., Analysis of granite- 

 gneiss by 486. 4«7 



Adirondack syenite, Asymmetric dif- 

 ferentiation in a bathvlith of.. 477-492 



, Character of 47S-480 



, Comparison of anorthosite with. 480 



.Location of bathylith of 478 



Africa. Former connection with Mada- 

 gascar of 230 



Aptox craters of southern New Mexico. 



211-220 



, Causes of formation of. . 



218-220 



■ .Depressions analogous 



to 217 



.Fossils of 213-215 



.General description of.. 



211, 212 

 , Geographic features of.. 



212, 213 

 .Geologic conditions ob- 

 taining lu 213-215 



. Hydrologic conditions of 217 



, Pre-Quaternarv forma- 

 tions of the 215, 216 



.Volcanic action of 216 



Aptoxiax intcrglacial stage, Erosion 



dating from 51.3 



AG-iSSiz glacier, Malaspina glacier con- 

 tributed to by 260 



Air and water currents. Action of. in 



concentration 6 



Ar.ABA.MA, Mississipni formation in 142 



— , Occurrence of Rockcjistle sandstone 



in 145 



Alamakee county. Ohio. Maquoketa 



limestone in 183 



AlasivA. Intrusive rocks of 4io 



— , Paleozoic and Mesozoic sediments in. 407 

 — . Recent advance of glaciers in Yaku- 



tat Bay region of 257-286 



— , Stratlgraphic succession in 325-332 



ALnnii^ERQUE quadrangle. New Mexico, 



Geology of 303. 304 



Aldex. , Record of remarks by. . . . 641 



Alexander, Bexxo, cited on crevasses 



of Seward glacier . .' 277 



Algoxki.\x period. Oceanic revolution 



of the 250 



Aleeoaxy county, Character of coal 



bed in 45, 46 



, Maryland, Section in 45 



Alleghextbs, Monongahela formation 



east from the 45-47 



Alleghexy county. Coal beds in 58 



, Occurrence of Waynesburg lime- 

 stone in 41 



— formation. Sandstones of the... 151.152 



.Thickness and composition of 150-154 



— • — , Variations in intervals between 



Beaver and 153-154 



— mountains, Monongahela formation 



west from the 47-64 



Allexite, Occurrence in Adirondack 



syenite of 470 



Aniauroflsis islandiciis. Location of. 520-521 

 Amesbury. Massachusetts. Occurrence 



of non-fossil if erous clays at 529 



— water works, Depth of wells of 513 



Page 



Ames limestone. Fauna of the 167 



, Occurrence of 156 



Ami, H. M.. Election of 647 



— , Record of remarks by 637, 641 



Ammoxia a result of volcanic activity. 20 

 A.m.moxiu.m chloride. Cause of precipi- 

 tation of 21 



Axalyses : Anorthosite 486, 487 



— : Augite syenite 486-487 



— : Basic syenite 4S6-487 



— : Gabbro 486, 488, 489 



— : Granitic syenite 486, 487, 491 



— : Norite 486 



— : Ouartz syenite 486, 487 



— : Volatile in Pittsburg coal bed.... 32 

 AxALYSis of the processes of geological 



concentration 4 



AxDERSox. Robert; Earthflows at the 

 time of the San Francisco earth- 

 quake (abstract ) 643 



AxDREWs, E. B.. cited on a coal bed 



near Marietta, Ohio 137 



■ — coal beds near Marietta, Ohio. 136 



fossil formations in Ohio 143 



his section at Baresville. Ohio 



township 134 



Monongahela formation in 



Ohio 68, 70, 771, 78 



Redstone limestone 34 



sandstone in Athens county. 76,81 



^ section at Athens county, Ohio 75 



Baresville 110 



in Center, Ohio 74 



Monroe county, Ohio.... 



106. 107, 133 



sections in Noble county, Ohio. 132 



West Virginia 109 



shale in Meigs county, Ohio.. 81 



— , Title of paper by 71, 72 



— cited on Waynesburg sandstone 98 



Axhydrite, Change to gypsum of 22 



AxoRTHosiTE, Analysis of . . . .486. 487. 489 

 — , Border relations between syenite 



and 481-482 



— , Dei'ivation of 485 



— gabbro. Table of comparisons of gab- 



bro and 489 



— outlier in Litchfield Park 483 



— soaked liy svenite. Occurrence of.... 482 

 AxsTEAD. D. T.. cited on his book on 



the Ionian islands 222 



AxTHRACiTE field. Character of north- 

 ern 147 



— fields. Reference to northern 144 



southern 144 



western middle 144 



AxTiCLixES, Development of 391 



"AxTiLEEAX continent." Former con- 

 nection of North and South Amer- 

 ica by 236 



Ap-Atite, Occurrence in Adirondack sye- 

 nite of 479 



Appalachia, Composition and extent 



of the 394, 398 



— , Occurrence of intrusives in rocks of. 408 



— . Pre-Cambrian movements in 403 



— . Result of pre-Cambrian movements 



in 403 



App-Alachiax area. Location and extent 



of 142 



— basin. Carboniferous of 29-178 



, Nomenclature of 178 



(693) 



