86 BIBLIOGRAPHY AND INDEX OF N. A. GEOLOGY, [bull. 135. 
515 Smith (Eugene A.). Geological surveys in Alabama. 
Jour, of Geol., vol. ii, pp. 275-287. 
Gives an account of the operations of the various geological sur- 
veys of Alabama. 
516 The post-Eocene formations of the Coastal Plain of Alabama. 
Am. Jour. Sci., 3d ser., vol. xlvii, pp. 285-296. 
Describes the Pleistocene, Pliocene, Miocene, and Eoceue deposits 
of Alabama and reviews previous descriptions of these and other beds 
of the Mississippi Valley. 
517 Geological map and explanatory chart of Alabama. 
Ala. Geol. Surv., Montgomery, Alabama. 
Contains a colored geologic map of the State and a sheet explaining 
the lithologic character and distribution of the formations. 
518 Langdon (Daniel W., jr.), and Johnson (Lawrence C). On 
the geology of the Coastal Plain of Alabama, Cretaceous, 
Tertiary, and post-Tertiary formations. 
Ala. Geol. Surv., pp. xxiv-f-759, pis. i-xxix. 
Contains a general sketch of the geology of Alabama and a descrip- 
tion of the lithologic and faunal characters, and the distribution in 
Alabama of the Cretaceous, Tertiary, and post-Tertiary formations. 
519 Smith (Erastus G.). Artesian wells as a source of water supply. 
Sci. Am. Suppl., vol. xxxvii, pp. 15065-15066. 
Discusses briefly the geologic conditions essential to the existence 
of artesian wells and the chemical character of artesian water supply. 
520 Smith (George Otis). Notes on crystals of scapolite, gypsum, and 
fayalite recently acquired by the university cabinet. 
Johns Hopkins Univ. Circ, vol. xiii, No. 112, pp. 81-83. 
Describes the crystallographic characters of the crystals mentioned. 
521 Smith (James Perrin). The Arkansas Coal Measures in their rela- 
tion to the Pacific Carboniferous province. 
Jour, of Geol., vol. ii, pp. 187-203. 
Abstract : Am. Jour. Sci., 3d ser., vol. xlvii. p. 482 (10 1.). 
Compares the Coal Measures of Arkansas with the Permo-Carbon- 
iferous beds of Kansas and Nebraska and discusses the classification 
and ago of the Arkansas coal beds and the character of the Carbon- 
iferous strata in other parts of western United States. Presents a 
table showing the correlation of the Arkansas Coal Measures with 
those of the Pacific Carboniferous province. 
522 The metamorphic series of Shasta County, Cal. 
Jour, of Geol., vol. ii, pp. 588-612. 
Describes the geologic structure in this county and the lithologic 
character and fauna of the Carboniferous and Juratrias formations. 
523 Age of the Auriferous slates of the Sierra Nevada. 
Geol. Soc. Am., Bull., vol. v, pp. 243-258. 
Abstracts: Am. Geol., vol. xiii, p. 215 (£p.); Am. Nat., vol. xxviii, 
pp. 414-415 (ip.). 
Reviews the opinions of other writers on this subject and the results 
shown by recent discoveries and determination of fossil forms from the 
Carboniferous, Triassic, and Jurassic strata at diiferent localities in the 
Sierra Nevada. Discusses the correlation of the Mariposa and Aucella- 
beariug rocks with the Jura of Europe. 
