AMEEICA. 125 



mineral springs of Colorado, on a great find of Tertiary mammal- 

 remains near the Gallinas Mountains, on the hot springs N.E. of Abi- 

 quin, and generally on the geology of the districts visited, finishing 

 with a few theoretical considerations as to the origin of old climatal 

 changes. G. A. L. 



Ludlow, Capt. William. Report of a Reconnaissance of the Black 

 Hills of Dakota, made in the summer of 1874. Pp. 12-1, 3 maps 

 (1 geological). 8vo. Washington. 



Geological Report, by Prof. N. H. Winchell, pp. 25-G6 (7 woodcuts). 

 Gives an account of the observed facts in a journalistic form, with 

 details of sections, under the following heads : — From the Rod River of 

 the North to Fort Abraham Lincoln. Entrance into the Rlack Hills. 

 Through the centre of the Black Hills. • From Custer Park to Bear 

 Butte. From Bear Butte to Fort Abraham Lincoln. Then follows a 

 *' Resume of Geological Results," under the heads Cretaceous, Jurassic, 

 and Triassic, Carboniferous Limestone, Potsdam Sandstone, Schists and 

 Slates, Granite, Summary Section of the Rocks of the Black Hills, 

 Structural System of the Black Hills. The Geological Map of the 

 Black Hills is on a scale of 6 miles to an inch, and shows 11 divisions. 



Palasontological Report, by G. B. Grinnell, pp. 71-74. 



Description of New Fossils, by R. P. Whitfield, pp. 96, 97, plate. 

 The now species are Obolus pectlnoides (Potsdam Sandstone, French 

 Creek, Dakota) and Terebratvda Helena (Cretaceous, Black Hills). W. W. 



Macfarlane, Dr. James. The Coal-regions of America : their Topo- 

 graphy, Geology, and Development. AVith a coloured geological 

 map of Pennsylvania, &c. Pp. xviii, 695. Ed. 3 ; with a Supple- 

 ment for the year 1874. Plates and woodcuts. Svo. New York, 



Anthracite, pp. 7-82. Bituminous Coal, pp. 83-504. Triassic Coal, 

 pp. 505-528. Cretaceous Coal, pp. 529-596. Appendices : Origin of 

 Coal ; Rocks among which Coal is found ; Iron-ores of the Coal-regions ; 

 Statistics, &c., pp. 597-690. W. W. 



Machattie, A. T. On a Deposit of Gypsum in Sottthern Utah. 

 Chem. News, vol. xxxii. p. 56. 



Analysis of gypsum forming a large mound at White Mountain, on 

 the road from Salt Lake City to the southern portion of Utah. 



Mansell, F. W. Argentine and St. John del Rey (Gold Mines). 

 Min. Journ. vol. xlv. p. 1 359. 



Describes the lodes at Pique and Morro Vclho, Brazil. 



. Hydraulic Gold Mining. Min. Journ. vol. xlv. p. 1359. 



Describes the Big Blue Lead, California. 



Marcou, Jules. Untersuchungen in Californien. Verh. Ic.-h, geol. 

 lleiclis. pp. 215, 216. 



Mentions Miocene rocks as forming the mountains round St. Clara 

 Valley, &c., very like the Molasse and Nagclfluh of Switzerland. Near 

 Fort Tcjon are Eocene beds with Ccrithium. E. B. T. 



. [California.-] N. Jahrb. Heft ix. pp. 960, 961. 



Letter describing an expedition to a little-known part of S.E. Cali- 

 fornia. All the rocks between Los Angelos, San Fernando, San Gabriel, 



