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ticed for over twenty years. A storage reservoir and canals under construc- 

 tion by the Government will reclaim 282,000 acres more. The study of 

 the stratigraphy of the region shows that all the younger systems are repre- 

 sented down as far as the Devonian, and below that the Ordovician, Cam- 

 brian, and pre-Cambrian] occur. The Laramie has a much greater 

 development than any other co-ordinate division, although the Colorado, the 

 Pierre shale, and the Wasatch also show considerable thicknesses. Coal 

 has a widespread distribution in the Laramie and associated formations 

 and is mined at numerous points along the streams. Gypsum deposits are 

 extensively developed, but are not utilized except in a small way. 



H. H. 



Geology of the Long Lake Quadrangle. By H. P. Gushing. New^ 

 York State Museum, Bulletin 115 ; 88 pp., 20 pL, map. Albany, 

 1907. 

 The Long Lake quadrangle is situated on the western border of the 

 more rugged portion of the Adirondack Mountains. The topography of 

 the area is greatly diversified, for portions of both the high Adirondack 

 region and the lower "lake belt" are included. Fifty-seven lakes and 

 ponds, many being rapidly converted into marshes, are shown. All the 

 rocks of the quadrangle are of pre-Cambrian age and most of them belong 

 to the early portion of that long interval. Four groups have been differen- 

 tiated, most of them strongly metamorphosed: (i) A series of sedimentary 

 rocks, the Grenville series, with contemporaneous intrusions; (2) a series 

 of gneisses of igneous origin, perhaps older than the Grenville; (3) a series 

 of igneous rocks less profoundly altered and certainly younger than the 

 preceding; (4) a series of still younger igneous rocks of very slightly altered 

 character. Probably Ordovician deposits were laid down on the older rocks 

 but, if so, have been entirely removed by erosion. A full account of the 

 geological history of the northern Adirondack region is given by the same 



author in New York State Museum Bulletin No. 95. 



H. H. 



Mineral Solution and Fusion under High Temperatures and Pres- 

 sures. By Arthur L. Day. From the Fifth Year-hook of the 

 Carnegie Institution of Washington, pp. 177-85. Washington, 

 1907. 

 This paper is a summary of the work accomplished in geophysical 



research by the Carnegie Institution of Washington in 1906. The work 



