144 GEOLOGY. 



portion to their distance from the coast, the upheaval of the coast 

 being a fact. In those furthest from the coast a Corbula, not now in- 

 habiting the neighbouring shore, has been found. G. A. L. 



Williams, S. G. Notes on the Geology of some localities near Caiion 

 City, Premont County, Colorado. Bull. U.S. Geol. Surv. Terri- 

 tories, ser. 2, no. 5, pp. 249-251. 

 Gives a section in Oil Creek (tributary to Arkansas E.) in Cretaceous, 

 Jurassic, Triassic ?, and Carboniferous ? beds. Oil-springs occur 200 

 feet above the base of the Jurassic, A section in Coal and Oak Creeks 

 shows 9 coal seams, with a total thickness of 26 ft. 8 in. of coal, 

 besides 3 thin seams. The coal is Tertiary, and dips W. 7°. W. H. D. 



"Winchell, Prof. A. Supposed Agency of Ice -Floes in the Champ- 

 lain Period. Amer. Journ. ser. 3, vol. xi. pp. 225-228. 



Refers to huge tabular masses of limestone in Michigan in the 

 midst of semistratified sands (Drift). Connects these masses with ice- 

 floes formed during the gradual change from " a geologic winter to a 

 geologic spring " towards the close of the Glacial Epoch. G. A. L. 



Winchell, Prof. N. H. On the Parallelism of Devonian Outcrops in 

 Michigan and Ohio. Proc. Amer. Assoc, for 1875, pp. 57-59. 



Winchell, Prof. N. H., and W. Harrington. Geological and Natural 

 History Survey of Minnesota. Pourth Annual Report for 1875. 

 Pp. 162, coloured geological maps and illustrations. 8vo. St. 

 Paul. 



Pillmore, Olmstead, Dodge, and Steele Counties are reported on, and 

 geological maps of them given. 



Wolf, Th. [Geology of Ecuador.] Zeitsch. deutsch. geol. Gesell. Bd. 

 xxviii. Heft 2, pp. 391-393. 



Mentions preliminary results of a survey in Ecuador. Province 

 Loja is richest in minerals ; it consists of schists with gold-bearing 

 quartz-veins enclosing a Tertiary basin in which are beds with di- 

 cotyledonous plants. IS", of Loja is a granite-district with numerous 

 greenstone dykes. On the boundary between Ecuador and Peru is a 

 great variety of igneous rocks, greenstone veins containing gold. At 

 Zaruma are abundant gold-mines, all the quartz -veins here being 

 auriferous. Copper, lead, silver, and zinc occur. At Malacatos the 

 veins contain cerasine. E. B. T. 



Wrigley, Henry E. Special Report on the Petroleum of Pennsyl- 

 vania, its Production, Transportation, Manufacture, and Statistics. 

 Maps and illustrations. Second Geological Survey of Pennsyl- 

 vania, pp. viii, 122. 8vo. Harrishurg. 



Wulsten, Carl. The Silver Region of the Sierra Mojada. Denver. 



Report of the Department of Mines, Nova Scotia, for the year 1875. 

 Pp. vi, 106. Halifax. 



