56 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 162. 
420 Keyes (Charles R.) The genetic classification of geological phe- 
nomena. 
Jour, of Geol., vol. vi, pp. 809-815, 1898. 
Discusses previous attempts to form a genetic classification and gives 
a table showing the classification of geologic phenomena by genesis. 
421 — — [Review of "Batesville sandstone of Arkansas," by Stuart 
Weller.J 
Am. Geol., vol. xxi, pp. 129-131, 1898. 
422 [Review of "Geology of Massanutten Mountain in Virginia," 
by A. 0. Spencer.] 
Am. Geol., vol. xxi, pp. 191-192, 1898. 
423 Use of the term Augusta in geology. 
Am. Geo!., vol. xxi, pp. 229-2E5, 1898. 
•Discusses the nomenclature of the Mississippian series. 
424 Carboniferous formations of southwestern Iowa. 
Am. Geo]., vol. xxi, pp. 346-350, 1898. 
Gives a brief description of the subdivisions of the Missourian series 
exposed in this portion of the State. 
425 Remarks on the classification of the Mississippian series. 
Am. Geol., vol. xxii, pp. 108-113, 1898. 
Discusses the use of the terms Osage and Augusta, as subdivisions 
of the Mississippian series. 
426 [Review of "Occurrence of fossil fishes in the Devonian of 
Iowa," by Charles R. Eastman.] 
Am. Geol., vol. xxii, pp. 237-239, 1898. 
427 [Review of "The special report on Kansas coal," by Erasmus 
Ha worth and W. R. Crane.) 
Am. Geol., vol. xxii, pp. 384-388, 1898. 
428 Eolian origin of the loess. 
Am. Jour. Sci., 4th ser., vol. vi, pp. 299-304, 1898. 
Discusses the origin of the loess of the Mississippi Valley. 
429 Geographic development of the Crimea. 
Iowa Acad. Sci., Proc, vol. v, pp. 52-54, 5 figs., 1898. 
Includes a brief statement of the method of stratigraphic correlation 
termed orotaxis and of the relations of grade plain and great plane of 
sedimentation. 
430 Carboniferous formations of the Ozark region. 
Iowa Acad. Sci., Proc, vol. v, pp. 55-58, 1898. 
Describes the general relations of the formations in the Ozark region 
and gives a table of correlation. 
431 ■ Some geological formations of the Cap-au-Gres uplift [Missouri]. 
Iowa Acad. Sci., Proc, vol. v, pp. 58-63, pis. i-iii, 1898. 
Describes a fault at the locality, the general geologic section, and 
names and describes a number of new formations. 
