Reviews and Book Notices 



Miocene Foraminifera from the Monterey Shale of California, with 

 a Few Species from the Tejon Formation. By Rufus M. Bagg, 

 Jr. (U. S. Geological Survey, Bulletin No. 268, 1905.) Pp. 

 55, II plates, 2 figures. 



The Monterey Shale is 2,000-2,500 feet thick where the fossils were 

 collected. This was near Asuncion, in San Luis Obispo County. The 

 collecting was done by Professor Branner, of Leland Stanford University, 

 who also wrote an introduction to the Bulletin. 



The formation as a whole lies in a broad fold, but there are smaller 

 folds and numerous faults. The bulk of the shale is made of diatom 

 skeletons. 



Dr. Bagg finds sixty-six species and seventeen genera in the collection. 

 Most of them are common in the North Pacific today, so that conclusions 

 may be drawn as to the temperature and depth of the water where these 

 sediments were deposited. The water was probably less than 500 fathoms 

 deep. E. W. S. 



The Lead, Zinc, and Fluorspar Deposits of Western Kentucky. By 



E. O. Ulrich and W. S. Tangier Smith. (U. S. Geological 



Survey, Professional Paper No. 36, 1905.) Pp. 218, 22 plates, 



31 figures. 



The geology and general relations of the deposits are discussed by 



Mr. Ulrich and constitute Part I of this paper ; the ore deposits and mines 



are described, by Mr. Smith in Part II. The region has been subjected 



to abundant faulting, and the surface is quite rough and irregular on that 



account. The deposits are somewhat similar to other deposits of similar 



ores in the interior of the United States, but there are a number of unique 



features in lithologic and mineralogic associations. One of these is the 



presence of basic igneous dikes. Another is the abundance of fluorspar, 



especially where the lead and zinc ores occur. Thirdly, the ores are found 



principally in true fissure veins, which have resulted from fracturing and 



subsequent faulting. 



The minerals of economic importance are fluorite, barite, galena, 

 sphalerite, and smithsonsite. In addition, there occur cerussite, pyro- 

 morphite, sulphur, hvdrozincite, calamine, greenockite, chalcopyrite, 



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