ARID ARNOLD 17 



Page 

 Arid cycle in mountainous regions, Evolution and condition of... 31,589-592 

 initiated in a plains region, Conditions of 21, 592-597 



— erosion, A measure of ; Charles Keyes 26, 404 



— lands of America, Deflation of ' 21, 580-585 



— period of the Permian and Triassic 27, 181 



— physiographic stages, Profile of 21, 596 



— region, Arroyo-running (dry creeks) of 21, 575 



, Comparative effects of corrasion and deflation in 21, 585 



— — , Extent and volume of eolian trau.sportation in 21, 584 



, Extra limital effects of deflation of 21, 583 



, General corrasive phenomena in 21, 571 



, Importance of deflative process in 21, 585 



, Influence of through-flowing streams in 21, 575 



, Initial physiographic conditions of the 21, 587, 597 



— — , Limitations to geologic woric of water in 21, 571 



of America, Rio Colorado, Rio Grande, and Rio Pecos, The large 



perennial rivers of 21, 575 



— — , Subdivisions of 21, 544 



, Plains-forming tendency of wind action in 21, 581-58.3 



, Role of the plains flood-sheet in 21. 572-575 



■ — stage. Ideal type of early 23, 550 



— United States and northern Mexico, General characteristics of. 21.567,568 

 , Geographic provinces of, Map showing 21, 566 



— zones of the Pleistocene and pre.sent 27, 180 



Aridity, Deflation and relative efficiencies of erosional processes under 



conditions of 21, 565-598 



— , Essential features of 23, 543 



— , Eolation under the stimulus of 21. 20, 565-598 



Arizona, Bajadas of the Santa Catalina Mountains 26, 391 



— , Erosion and deposition in 25, 125 



— , Permo-Triassic formations of 30. 471, 491 



— , Permo-Triassic fossils from 30, 471, 491 



— , Permo-Triassic of 30. 155, 471 



— , Petrified log natural bridge near Ad;unana 21, 323-325 



— , Pine Creek Valley and travertine natural bridge in, Views showing.. 



21,335,336 



— , Record of rainfall in 25, 535 



Arkansas diamond-bearing peridotite area ; L. C. Glenn 23, 37, 726 



— , Geological work in 25, 166 



Arkose deposits. Classification of 27, 115 



Arnold, Ralph ; An Apalachicola fauna from Lower California 28, 223 



— cited on California oil field 28, 565 



natural bridge at Santa ( 'ruz, California 21, 326 



— oil sands 28, 596 



— , Correlation of the Lower :Miocene of California 26, 415 



— ; Economic value of paleontology 30,-153 



— , Excursion of California Meeting, August 14, 1915, in charge of 26, 417 



II — Bull. Geol. Soc. Am. 



