394 The American Geologist. December, 1896 
Herein lies the future of practical s^'floj^y, and hence the great sig- 
niflcance of these notes of Stelzner's, which are highly interesting in 
themselves, and are now accessible to anyone. Every mining man, ge- 
ologist, mineralogist and chemist will find in them a fund of informa- 
tion and suggestion. f. m. 
Gypsum Beds in Southern Arizona. Extensive stratified deposits 
of gypsum occur in the Santa Rita range of mountains, near the north- 
ern end, about twenty miles southeast of Tucson and fifteen miles or 
less from the line of the Southern Pacific railway. The thickness of 
the series is estimated at not less than two hundred fe'et. The strata 
are nearly on edge and appear to form a part of a great series of sedi- 
ments, shales and quartzites above the Lower Carboniferous limestone, 
which is largely developed in the Santa Rita mountains. 
Wm. I'. Blake. 
Arizona School of Mines, University of Arizona, Noi^emher, 1896. 
RECENT PUBLICATIONS. 
I. Government and State Reports. 
U. S. Geol. Survey, Bulletins. No. 123, A dictionary of geographic 
positions, Henry Gannett; No. 124, Revision of the American fossil 
cockroaches, with description of new forms, S. H. Scudder ; No. 125, 
The constitution of the silicates, F. W. Clarke; No. 126, A mineralog- 
ical lexicon of Franklin, Hampshire and Hampden counties, Mass., B. 
K. Emerson ; No. 128, The Bear River formation and its characteristic 
fauna, C. A. White ; No. 129, Earthquakes in California in 1891, C. D. 
Perrine; No. 130, Bibliography and index of North American geology, 
paleontology, petrology and mineralogy for 1892 1893, F. B. Weeks: No. 
1.31, Report of progress of the division of hydrography for the calendar 
years 1893 and 1891, F. H. Newell: No. 132, The disseminated lead ores 
of southeastern Missouri, Arthur Winslow: No. 133, Contributions to 
the Cretaceous paleontology of the Pacific coast: The fauna of the 
Knoxville beds, T. W. Stanton; No. 131, The Cambrian rocks of Penn- 
sylvania, C. D. Walcott; No. 1.35, Bibliography and index of North 
American geology, paleontology, petrology and mineralogy for 1891, F. 
B. Weeks. 
U. S. Geol. Survey, 15th Ann. Rept: Preliminary paper on the geol- 
ogy of the common roads of the United States, N. S. Shaler; The Poto- 
mac formation, L. F. Ward; Sketch of the geology of the San Francisco 
peninsula, A. C. Lawson: Preliminary report on the Marquette iron- 
bearing district of Michigan, C. R. VanHise and W. S. Bayley, with a 
chapter on the Republic trough, byH. L. Smyth; The general relations 
of the granitic rocks in the middle Atlantic Piedmont plateau, G. H. 
Williams; The origin and relations of central Maryland granites, C. R. 
Keyes. 
U. S. Geol. Survey, 16th Ann. Rept. Pt. II:— Geology and mining 
industries of the Cripple Creek district, Colorado, Whitman Cross and 
