134 GEOLOGY, 



graphically and chemically, under the names : — Metamorphic diorite ; 

 Mctamorphio diabase, containing microscopic remains resembling Chce- 

 tetes (perhaps foraminiferal) and Stromatojpora ; Chloritic schist ; Meta- 

 diabase schist ; and Argyllite. Analyses and microscopic representations 

 of the rock are given. G. A. L. 



Hayden, Dr. F. V. Annual Report of the United States Geological 

 and Geographical Survey of the Territories, embracing Colorado 

 and Parts of Adjacent Territories, &c. Pp. x, 515 ; 82 plates 

 (maps, sections, views, fossils). 8vo. Washington. 



Contains the following Reports : — Dr. F. V. Hayden : treating of the 

 Lignitic Group, the eastern base of the Pront or Colorado Range, 

 Ancient Lake Basins, &c. ; and the Geology of the Elk Mountains, with 

 a Report on the Geology of the N.W. portion of the Elk Range, by "W. 

 D. Holmes, pp. 19-71. 



Dr. A. C. Peale on the Geology of the Eagle, Grand, and Gunnison 

 Rivers, with catalogues of minerals and rocks, pp. 73-180. 



Dr. F. M. Endlich on the San Juan district, with a chapter on Mines 

 (which also occurs, almost entire, in Bull. U. S. Oeol. Surv. Territories, 

 Beej)ost, under Applied Geology), pp. 181-240. 



Dr. S. Aughey : The Superficial Deposits of Nebraska, pp. 243-269. 



Prof. L. Lesquereux on the Tertiary and Cretaceous Elora, pp. 271- 

 365. See post, under Plants. 



The other Reports are not geological. "W. H. D. & W. W. 



. Wotes descriptive of some geological sections of the country 



about the headwaters of the Missouri and Yellowstone Rivers. 



Bull. U. S. Oeol. Surv. Territories, vol. ii. no. 3, pp. 197-209, 



plates i-x. 



In Montana granite appears on the anticlinal axis, trending N.W. 



between the Jefferson and Madison Rivers, throwing oif the Silurian, 



Carboniferous, Triassic, Jurassic, Cretaceous, and Lignitic rocks, over 



the edges of all which volcanic tuff, breccia, and trachyte lie unconform- 



ably. Miocene, Pliocene, and Postpliocene lacustrine beds form terraces 



along the valleys. The auriferous gravels date back to the Glacial 



period. The volcanic rocks are of various dates, some being Postglacial. 



W. H. D. 



. Notes on the Lignitic group of Eastern Colorado and portions 



of Wyoming. Bull. U. S. Geol. Surv. Territories, ser. 2, no. 5, 

 pp. 401-411. 



Near Caiion City is a section of the Cretaceous series, from the 

 Dakota to the top of the Eox Hills group. The lowest Tertiary is 

 sandstone and clay, 300 feet thick, without fossils. Next is sandstone 

 with many fossil plants, 50 to 200 feet thick, underlying the bottom 

 coal. The Lignitic series is of brackish- water origin, no marine animal 

 ranging into it from the Eox Hills group, to which it is unconformable. 

 Beds of lignite occur in the Washakie group, which is of freshwater 

 origin and unconformable to the Lignitic. The same with the higher 



