356 REVIEWS 



From the report of the state mine inspector we learn that the pro- 

 duction of coal in 1900 reached the largest figure in the history of the 

 state, being 6,351,976 tons, valued at $4,883,024.18. 



In a paper on the petroleum industry, the state geologist supple- 

 ments his articles in the Twenty-first and Twenty-second reports, by 

 noting recent developments in the main Indiana field, as well as in sev- 

 eral smaller fields recently exploited. The paper is accompanied by a 

 map of the field. The oil and gas reservoirs of the state are found to be 

 mainly in the porous dolomitic upper portion of the Trenton limestone 

 which does not appear at the surface anywhere in the state. The 

 author conceives the dolomitization to have resulted from the concen- 

 tration of sea water in the shallow indentations of the coast or margi- 

 nal lakes, with resulting substitution of magnesium for calcium in the 

 rock below. The total production of oil in 1900 was over 5,000,000 

 barrels, valued at about $5,000,000, one dollar per barrel. 



The last paper in the report is from the pen of Dr. E. M. Kindle, 

 and is entitled, the "Devonian Fossils and Stratigraphy of Indiana." 

 It is one of the most important contributions which has ever been 

 made to the knowledge of the paleontology of the state, and, with the 

 exception of Dr. Foerste's work on the Silurian, is the only attempt 

 which has been made to systematically explore the faunas of a group of 

 Indiana rocks. 



The first part of the paper takes up in detail the stratigraphy of the 

 various localities, and discusses their faunal relations and correlation. 

 The discovery at Delphi, Ind., of a new fauna in the New Albany shale 

 leads Dr. Kindle to regard that formation as the western equivalent of 

 both the Portage and Chemung, instead of the latter alone. Another 

 interesting fact is that the Devonian limestones, which are well differ- 

 entiated into the Sellersburg beds and the Jeffersonville limestone in 

 the southern part of the state, give way to the dolomitic Geneva lime- 

 stone and the Pendleton sandstone in the middle area, but resume their 

 double facies again in the Wabash region, noting, however, that the 

 Sellersburg beds hold very different faunas in the two regions. 



The second part of the paper deals with the paleontology of the 

 Devonian beds. The specific descriptions are preceded by keys for 

 the discrimination of the species attributed to each genus, and these, 

 taken in connection with the thirty-one excellent plates, comprising 

 more than three hundred figures, make the paper an exceedingly useful 

 handbook of this formation, particularly for Indiana students. 



C. E. SlEBENTHAL. 



