xviii INDEX TO VOLUME IV 



PAGE 



Leonard, A. G. Origin of the Iowa Lead and Zinc Deposits. (Abstract) - 373 



Leopard Rock - - - - .. - - - - - - 377 



Leucitic Rocks - - - - - - - - - - -- 840 



Leucite Rocks of the Bolsena Region - - - - - - - - - 555 



Leucite-Trachyte ------------ 840 



Leverett, Frank. Loess of Western Illinois and Southeastern Iowa. (Abstract) 244 



Relation between the Ice-Lobes South from the Driftless Area. (Abstract) 757 



Lindgren, Waldemar. Age of the Auriferous Gravels of the Sierra Nevada 881 



Gold-Silver Veins of Ophir, California. (Abstract) - - - - 373 



Lines of Glacial Flow ----------- 922 



Literature, Geological, of the South African Republic ----- i 



Literature of North American Pre-Cambrian . - . . . 352, 744 



Literature, Recent .......... 377^ 654 



Little Missouri Buttes --...-..---35 



Little Rocky Mountains, Geology of ------- - 399 



Little Sun Dance Dome, Wyoming --.---.. 29 



Livingston Folio, United States Geologic Atlas .-...- 246 



Loess in the Wisconsin Drift Formation. R. D. Salisbury .... 929 



Loess of Western Illinois and Southeastern Iowa ...... 244 



Lyman, B. S. Chalfont Fault Rock, So-called. (Abstract) .... 245 



Yardley Fault. (Abstract) --------- 245 



Madsen, Victor. Istidens foraminiferer i Danmark og Holsten og deres betyd- 



ning for studiet af istidens aflejringer - - - - - -119 



Magmatic Alteration of Hornblende and Biotite. H. S. Washington - - 257 



Maps, Large Scale, as Geographical Illustrations ------ 484 



Marbut, C. P\, J. B. Woodworth and. The Queen's River Moraine in Rhode 



Island -..-...----- 691 



Marine Trias, Classification of -----.-.. 385 



Marked Sedimentary Rock --....---- 653 



Mato Tepee 31 



Maury, C. Joaquina, G. D. Harris and. Geology of Chiapas, Tabasco, and the 



Peninsula of Yucatan. Carlos Sapper. (Translation) - - - 938 



Mechanics of Glaciers. I. H. F. Reid 912 



Mechanical Action of Water and Ice ........ 850 



Meeting of American Association for the Advancement of Science. (Editorial.) 



T. C. C. - - - - - - - 725 



Mendon Kame Area - - - - - - - - - - -144 



Merocrinus Salopise - - - - - - - - - - -7S8 



Merrill, G. P. Principles of Rock Weathering .... - 704^ 850 



Mexico, Geology of Portions of - - - - - - - - - 938 



Migration of Divides .-.......-- 580 



Miocene Period of the Sierra Nevada --...... 897 



Mission Butte ............ 416 



Mississippi Valley Streams - - - - - - - - - - 668 



Missouri, Areal Geology of. (Notice) ........ 982 



Granite and Porphyry Areas -.-..... 375 



Physical Features .-.-...... 877 



