REVIEWS 825 



making the correlations fairly certain. The sections show that toward 

 the south the sandstones of the oil horizons of Ohio rapidly grade into 

 shales. Even the shales of the Bedford and Berea formations become 

 very thin although they do not disappear. These changes are unfavor- 

 able for oil-bearing sands in the southern part of the state. 



A number of changes in correlations in formations of the Waverlian 

 are made from those given in earlier Kentucky reports and in the 

 Richmond Folio. The latter part of the bulletin treats of the possi- 

 bilities of these beds in producing building stones and clays. If a map 

 of the area covered by the report had been given it would have made 

 part of the discussion more intelligible. 



W. B. W. 



The Geology of the Rolla Quadrangle. By Wallace Lee. Missouri 

 Bureau of Geology and Mines, XII. Pp. 117, pis. 12, figs. 17, 

 maps 2. 



The area covered by this report is in the central Ozark region of 

 Missouri and includes Phelps and Dent counties. The strata described 

 include the Gasconade, Roubidoux, and Jefferson City formations. 

 The general horizon is of interest because it includes part of the Ozarkian 

 and the Canadian of Dr. Ubrich's classification. The author follows 

 the usual classification, placing these beds in the Upper Cambrian. A 

 few erosion remnants of Carboniferous age are found in the northeastern 

 part of the area. 



An interesting structural feature is found in a number of sink areas. 

 The author believes it was developed from the caving and subsequent 

 filling of solution cavities. 



The economic products of this quadrangle are negligible and the 



chief value of the report lies in its contribution to the general stratigraphy 



of the region. 



W. B. W. 



Glass Sands of Oklahoma. By Frank Buttram. Oklahoma Geol. 

 Survey, Bull. No. 10, 1913. Pp. 91, pis. 8, figs. 3. 



Approximately one-half of this report is taken up with a general de- 

 scription of the glass industry. As the author is a chemist he has treated 

 chemical processes in glass production rather fully. 



Notable glass sand deposits of the state are limited to three areas: 

 the Arbuckle Mountains, southeastern Oklahoma, and near Tahlequah, 



