62 The American Geologist. July, i9a) 
Dawson, George M. 
Summary report of the Geological Survey Department for the year 
1899. Geol. Surv. Can. Sessional paper No. 13a, pp. 224. Ottawa, 1900. 
Gould, C. N. 
Phases of the Dakota Cretaceous in Nebraska. (Am. Jour. Sci., vol. 
5, pp. 429-433. June, 1900.) 
Grabau, A. W. 
Siluro-Devonic contact in Erie county, New York. (Bull. Geol. Soc. 
Am., vol. II, pp. 347-376, pis. 21-22. May, 1900.) 
Grlmsley, G. P. (and E. H. S. Bailey.) 
Special report on G\psum and Gypsum cement piasters. Univ. 
Geol. Surv., Kans. vol. v, Topeka, 1899. 
Haworth, Erasmus. 
Relations between the Ozark uplift and ore deposits. (Bull. Geol. 
Soc. Am., vol. II, pp. 23i-240r. May, 1900.) 
Heilprin, Angelo. 
The shrinkage of lake Nicaragua. (Sci. Am., Sup., May 19, 1900.) 
Knight, Wilbur C 
Jurrassic rocks of southwestern Wyoming. (Bull. Geol. Soc. Am., 
vol. II, pp. 377-388, pi. 23. May, 1900.) 
Lane, A. C. 
Elevation of Saginaw. (Mich. Miner, vol. 2, p. 19. June, 1900.) 
Lane, A. C. 
The Geothermal Gradient in Michigan. (Am. Jour. Sci., vol. 4, pp. 
434-438. June, 1900.) ? .:■ 
Ladd, Geo. E. 
A preliminary report on the clavs of Georgia. (Bull. No. 6, Geol. 
Surv. Ga. 1898.) 
Leverett, Frank. 
The Illinois Glacial lobe. Mon. 38, U. S. Geol. Surv. pp. 817, 24 
plates. Washington, 1899. 
Logan, W. N. 
A North American Epicontinental sea of Jurassic age. (Jour. Geol., 
vol. 8, pp. 241-273. April-May, 1900.) 
Matthew, E. B. 
Granite rocks of the Pike's Peak quadrangle. (Jour. Geol., vol. 8, pp. 
214-240. April-May, 1900.) 
McCalley, Henry. 
Report on the Warrior Coal basin. Geol. Surv. Ala., pp. 327, 7 plates, 
map. Jacksonville, Fla., 1900. 
McCallie, S. W. 
A preliminary report on the Artesian-well system of Georgia. Bull. 
No. 7, Geol, Surv. Ga., 1898. 
Preston, H. L. 
New meteoric iron from Oakley, Logan county, Kansas. (Am. Jour. 
Sci., vol. 4, pp. 410-412. June, 1900.) 
