112 GEOLOGY. 



trations and an atlas. Pp. 734, 2, 2, 4, — 28 plates (sections and 

 plans). 8vo. Jefferson City. 

 Chap. 1. Introductory. Chap. 2. General Geology. Chap. 3. Caves, 

 Supplies of Water. Chap. 4. Soils. Chap. 5. Minerals, Rocks. Chap. 6. 

 S.W. Coal-field. Chaps. 7-21. Descriptions of various Counties, with 

 details' of sections, analyses of iron-ores, and reference to economic 

 matters! These chapters are partly by C. J. Norwood. Chaps. 22-28. 

 Lead and Zinc regions of S.W. Missouri, by A. Schmidt and A. Leon- 

 HiRD, with descriptions and analyses of ores, minerals, and rocks. 

 Chaps. 29-32. Lead Eegion of Central Missouri, by A. Schmidt, with 

 descriptions and analyses of minerals and rocks. Chap. 33. Iron Ores 

 of Missouri, by A. Schmidt. Chap. 34. Lead Mines, S.E. Missouri, by 

 J. R. Gage. Chap. 35. Iron Ores of S.E. Missouri, by P. N. Mooee. 

 Appendices. History of Lead-mining, Statistics, Mineral Springs, and 

 Chemical Analyses, by R. Chauvenet. The Atlas contains 11 maps, 

 some coloured geologically, and 4 sheets of vertical sections. W. W. 

 RuEBANK, L. S. Observations on the Surface-Geology of N. Caro- 

 lina, with special reference to some phenomena of the Drift of the 

 northern United States. Proc. Boston Nat. Hist. Soc. vol. xvi. 

 pt. 2, pp. 150-155. 

 Describes the boulder-like forms of this district, and shows that they 

 are not the result of attrition, but of chemical and atmospheric agencies 

 acting upon concretionaiy* rocks : this structure of the granite is noticed 

 in railway-cuttings in Guilford Co. The decomposed state of the crys- 

 talline rocks and the resulting clays are noticed. In relation to the 

 Drift, it is argued that the force of that period was exerted, not in 

 wearing and grinding down the solid rocks, but chiefly in carrying for- 

 ward and commingling the materials already disintegrated. Prom the 

 comparatively small amount of disintegration that has gone on since the 

 Drift period, the author concludes that the time which has since elapsed 

 must be short compared with the ages during which the rocks had been 

 previously undergoing decomposition by atmospheric agencies. E. B. T. 

 Chase, A. W. The auriferous Gravel Deposit of Gold Bluffs. Amer. 



Journ. ser. 3, vol. vii. pp. 379-384. 

 This deposit is on the coast-line of Klamath County, California. The 

 author thinks it is due to a great river occupying formerly the bed of 

 the Klamath, but having a different debouchure. He adds a note from 

 Prof. Dana, who thinks it probable that the deposit dates partly from the 

 close of the glacial era and partly from the later portion of the Champlain 

 period. Information as to the working of the gold is given. G. A. L. 

 Clark, R. N. Iron and Coal in Colorado. Coll. Guard, vol. xxviii. 



pp. 531, 532. 

 There are in Colorado the '' Caiion-City," the " Trinidad," and the 

 "Cucharas-river" coal-fields. The last is unsurveyed. The first con- 

 tains about 34 square miles, with two principal seams, one 64 inches 

 thick, and worked. Two analyses of this coal are given. Iron-ores 

 exist near the coal (clay-ironstone and magnetic ore). In the Trinidad 



