826 REVIEWS 



in the northeastern part of the state. The greatest deposits are in the 

 Arbuckle Mountains, in the Simpson formation of Ordovician age. This 

 formation is from 1,200 to 2,000 feet thick, and the sands outcrop at 

 four horizons. Five sections give an average thickness for the glass 

 sands of 248 feet. The supply of raw materials seems almost inexhaust- 

 ible but transportation facilities are lacking in most localities. In south- 

 eastern Oklahoma the Trinity sandstone at the base of the Cretaceous 

 carries commercial quantities of good glass sand, and several localities 

 are readily accessible. In the northeast the Burgen sandstone, which 

 has been correlated with the St. Peters, carries a 50-foot bed of high- 

 grade glass sand, but is too remote from railroads for present develop- 

 ment. 



Analyses of these sands show that they compare very favorably 

 with deposits now being worked in adjacent states. Having a marked 

 advantage in the use of natural-gas fuel, Oklahoma sands should prove 

 strong competitors for the glass market of the central Mississippi Valley. 



W. B. W. 



Inland Lakes of Wisconsin. By Edward Birge and Chancy 

 Juday. Wisconsin Geol. Survey, Bull. No. 27, 1914. Pp. 

 132, figs. 8, tables 4, maps 29. 



A large portion of the data in this report has been published in 

 various bulletins scattered through a dozen years. It seemed desirable 

 to gather this material in a single volume, together with additional data 

 not published hitherto. 



No lakes occur in the southwest or driftless area, and all the lakes 

 of the remaining three-quarters of the state are of glacial origin. In 

 general the lake basins were formed in four different ways: by melting 

 of blocks of ice imbedded in the glacial debris, by damming of preglacial 

 valleys, by interlocking of terminal moraine deposits, and by inequalities 

 in deposition of ground moraine. 



The total number of lakes runs into the thousands, but only the 

 larger ones are described. There are 21 hydrographic maps, and with 

 each is a brief report on the geology and topography of adjacent regions 

 and the origin of the lake basins. 



Tables give data on the locations of the lakes, their size, and the 

 depth and shape of their basins. Lake Winnebago with an area of 215 

 square miles is by far the largest in the state. Few of the lakes exceed 

 one hundred feet in depth. The United States Geological Survey has 



