330 REVIEWS 



The area under consideration lies to the southeast of the main proved 

 oil and gas belt of the state. Six deep tests showed no oil and but four 

 of them gas. It is to be noted, however, that not one of the six was 

 drilled on a favorable structure. 



Webster County, although possessing an immense amount of good 

 coal, has but little commercial mining and no coke production. There 

 are nineteen coal beds that appear to be workable commercially. The 

 author estimates that the total recoverable tonnage present is about 

 5,144,000,000 tons. 



Other minor resources include the following: (i) unutilized water 

 power; (2) iron ore (possibly); (3) clay, not extensively utilized; (4) 

 limestone the Hinton member of the Mauch Chunk and the Green Brier 

 limestone; and (5) sandstone, suitable for building purposes in both the 

 Pennsylvanian and Mauch Chunk. 



The portion of the report devoted to paleontology includes some 

 notes by W. Armstrong on invertebrate fossils from the Pottsville 

 series. The following contributions are made: 



1. "The Maximum Size of West Virginia Derbyas as Influenced by 

 Sediments." The author concludes that the largest specimens of each 

 species are to be found in the light-colored shales and the purer argil- 

 laceous limestones, the smallest in the fine black sediments. 



2. "An Example of Shell Regeneration in Derbya crassa." This is 

 an instance of abnormal shell growth repairing a probable break in the 

 shell during the life of the animal. 



3. "Notes on the Correlation of Certain Fossiliferous Members of 

 the Pottsville Series." A discussion of the present uncertain status of 

 the question is given. Some faunal lists are included. 



4. "Fossiliferous Shale Beds in the Row.esburg Section." 



5. "Invertebrate Fossils Collected from the Pottsville Series of 



Webster County." In general the Pottsville of West Virginia shows 



three faunal types, a normal marine type, a restricted marine type, and 



a fresh- water type. Thirty- two species are listed, of which twenty- three 



are described and a number figured. 



A. C. McF. 



Bulletin No. j6, Illinois State Geological Survey. Yearbook for 1916, 

 consisting of administrative report, and economic and geologic 

 papers. Pp. 188, figs. 7, pis. 16, tables S3- 

 The report consists of four papers, the first of which is the adminis- 

 trative report of F. W. De Wolf, state geologist, for 19 16. In Part II 

 by N. 0. Barrett, on the mineral resources of the state in 1916, the 



