REVIEWS 401 



sharply folded and faulted. A heavy mantle of glacial drift covers most 

 of the county, and details of structure are learned only from mine work- 

 ings. No estimate is made of the amount of coal available. 



W. B. W. 



Geology and Water Resources of Tularosa Basin, New Mexico. By 

 O. E. Meinzer and R. F. Hare. U.S. Geol. Survey, Water 

 Supply Paper 343, 1915, pp. 317, pis. 19, figs. 51. 



The Tularosa Basin is shown to be a down-faulted block between 

 highlands of Cretaceous, older Mesozoic (?), and Carboniferous sedi- 

 mentary rocks lying upon granite. The Pennsylvanian Manzano group 

 of Red Beds here has a thickness of about 2,500 feet, and contains much 

 gypsum. Tertiary intrusives of several types cut the older rocks. The 

 valley bottom is covered with Quaternary deposits, comprising water- 

 laid gravels and finer sediments several hundred feet thick, together 

 with modern dune sands and saline deposits. There are two recent lava 

 flows, with well-preserved cinder cones and craters. 



An unusual feature of this valley is an area of 270 square miles of 

 dunes of gypsum sand, still in motion. The gypsum is derived from 

 deposits on the floor of a large alkali flat to windward (west) of the dune 

 area. The gypsum of the playa in turn was derived from the bedded 

 gypsum in the Manzano group, the solution of which has given rise to 

 numerous sink-holes, locally so abundant as to have produced karst 

 topography. 



C. W. T. 



Limestone Road Materials of Wisconsin. By W. O. Hotchkiss 

 and Edward Steidtman. Wisconsin Geol. Survey, Bull. 34, 

 1914. Pp. 136, pis. 41, figs. 2. 

 The importance of thorough investigation of road-building materials 

 is shown by the fact that this state appropriated approximately $1,250,- 

 000 for highway purposes in 19 14. This report treats of limestone 

 materials only. Part I describes various standard tests on road mate- 

 rials and emphasizes the importance of thorough testing. The chief 

 limestone horizons are discussed briefly. Part II takes up by counties 

 the limestone areas of the state. There is a brief description of lime- 

 stone resources, with results of samples tested, and 40 areal geology 

 maps of different counties. Wisconsin is said to be more abundantly 

 supplied with road materials than any of the neighboring states. 



W. B. W. 



