weeks] PALEONTOLOGY, PETROLOGY, AND MINERALOGY, 1894. 47 
209c Gibson (A. M.). Report on the coal measures of Blount Mountain. 
Abstracts : Am. Jour. Sci., 3d ser., vol. xlvii, p. 319 (8 1.) ; Am. Geol., 
vol. xiii, p. 284 ( £ p.). 
Noticed in Bibliography and Index for 1892 and 1893. 
210 Gilbert (Grove Karl). [Correlation of clastic rocks.] 
Int. Cong. Geol., Coinpte Rendu, 5th session, pp. 151-155. 
Discusses the physical and biotic methods of correlation of rocks. 
21 1 Physical geography of the region. 
Int. (Jong. Geol., Compte Rendu, 5th session, pp. 261-267. 
Describes the physical and climatic features of the parts of the United 
States traversed by the Rocky Mountain excursion of the International 
Congress of Geologists. 
212 From the Ohio to the Mississippi Eiver. General sketch. 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 289-290. 
Mentions the different exposures of Silurian, Devonian, and Carbon- 
iferous rocks and describes the glacial phenomena of the region trav- 
ersed by the geological excursion. 
213 Great Salt Lake and Lake Bonneville. Fault Scarps. Itin- 
erary, Pocatello, Idaho, to Salt Lake City, Utah. 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 374-380. 
Describes the geologic history of Lake Bonneville, the fault scarps 
of the mountains of the Great Basin, and the geology along the rail- 
road from Pocatello to Salt Lake City. 
214 Great Salt Lake Valley, and Itinerary, Salt Lake City to 
Spanish Fork Canyon [Utah]. 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 391-397. 
Describes the geologic history of Great Salt Lake Valley and the 
local geology along the railroad to Spanish Fork Canyon. 
215 Itinerary, Chicago to Niagara Falls. 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 453-458. 
Describes the local geology between Chicago and Niagara Falls, 
through Michigan and the Province of Ontario, and the geologic his- 
tory of Niagara Falls. 
216 Itinerary, Albuquerque, N. Mex., to Flagstaff, Ariz., and to 
the Grand Canyon. 
Int. Cong. Geol., Compte Rendu, 5th session, pp. 468-474. 
Describes the geology along the route traversed by the western 
excursion of the International Congress of Geologists. 
217 The name "Newark" in American stratigraphy. 
Jour, of Geol., vol. ii, pp. 55-59. 
Discusses the principles of stratigraphic nomenclature in reference 
to the use of the term ''Newark' 7 in geologic literature. 
218 Continental problems of geology. 
Smith. Inst., Ann. Kept., 1891-92, pp. 163-173. 
Noticed in Bibliography and Index for 1892 and 1893. 
218a The chemical equivalence of crystalline and sedimentary 
rocks. 
Abstract: Am. Geol., vol. xiii, pp. 213-214. 
