870 INDEX TO VOLUME VI 
Ohio River Cut-off. A.C. Veatch - - - - 5 - = = - 
Ohio Valley in Southern Indiana, Notes on the. Arthur C. Veatch - - 
On the Origin of Certain Siliceous Rocks. 
I. Notes on Arkansas Novaculite. Orville A. Derby - - - 
II. On the Origin of Novaculites and Related Rocks. J. C. Branner 
Organic Markings on Marquette Iron Ores. Noticed - - - - - 
Osann, A. Petrography of the Apache Mountains. Noticed - - - - 
Ostracoderms, Development and Geological Relations of - - - - 
Ottawa Basin, Sands and Clays of the. R.W. Ells. (Abstract)  - = - 
Ozarks, Stratigraphy of the Southern. J. C. Branner. Reviewed by C. R. 
Keyes - = - - . - - - - 5 - - 
Paleontology, Bibliography and Index of North American, for 1896. F. B. 
Weeks. Reviewed by H. F. Bain - - - - - - - 
Palaeozoic Sediments of Arkansas, Thickness of. J. C.Branner. Reviewed by 
(Gols INCHES 4c - . - e - - - - - 
Panama, Isthmus of, and Portions of Costa Rica, Geological History of. R. 
T. Hill. Reviewed by R. D. Salisbury — - - - - - - 
Peale, A.C. Three Forks Folio, U.S. G.S. Noticed - - - - - 
Peary, R. E. Northward over the Great Ice. Reviewed by T. C. Chamberlin 
Penfield, S. L. Manual of Determinative Mineralogy, etc. Reviewed - - 
Penhallow, D. P. Quoted as to Toronto Formation . - - - - 
Peorian Soil and Weathered Zone {Toronto Formation?). Frank Leverett  - 
Petrographical Province of Essex County, Mass. I. H.S. Washington - 
Physics and Chemistry of Solids. Professor Spring. Reviewed by C. F. Tol- 
man, Jr. - - - - - - - - - - - ° 
Physiographic Types. Topographic Atlas of the United States. Henry Gan- 
nett. Reviewed by W. M. Davis - - - - - - - 
Pirsson, L. V. Etymology and Use of the word Osar. (Editorial) - - - 
Pirsson, L. V. and W. H. Weed. Castle Mountain Mining District. Noticed 
Little Rocky Mountains, Montana. Noticed - - - - - 
Plants, Fossil, for Students of Geology and Botany. Vol. I. A.C. Seward. 
Reviewed by Henry C. Cowles i - - - = = = 
Pliocene Mammals - - - - - - - = = - - 
Postglacial Connecticut at Turners Falls, Massachusetts. M.S. W. Jefferson 
Powell, J. W. An Hypothesis to Account for the Movement in the Crust of the 
Earth - - - - - - - - - - - - 
Pre-Cambrian Geology of Southeastern Missouri. Noticed - - - - 
Pre-Cambrian Geology, Principles of. C. R. Van Hise. Reviewed by Bailey 
Willis - - > - - - - = - - - = 
Pre-Cambrian Literature, Summaries of Current North American. C. K. Leith 
527,739; 
Pressure within the Earth, Note on the. Charles S. Slichter -— - - - 
Probable Stratigraphical Equivalents of the Coal Measures of Arkansas. Charles 
R. Keyes - - - - - - - - 2 - 2 ° 
Provincial Faunas, A Systematic Source of Evolution of. T. C. Chamberlin 
