Reviews 



The Mississippian Brachiopoda of the Mississippi Valley Basin. By 

 Stuart Weller. Monograph I, State Geological Survey 

 of Illinois, June 10, 1914. Pp. 508, pis. 83, figs. 36. 

 In the introduction a brief description and classification of the Missis- 

 sippian formations as shown along the Mississippi River and in adjacent 

 regions is given. The formations recognized and described are as follows : 

 V. Chester group. 



Clore formation. 

 Palestine formation. 

 Menard formation. 

 Okaw formation. 

 Ruma formation. 

 Paint Creek formation. 

 Yankeetown formation. 

 Renault formation. 

 Brewersville formation. 

 IV. Ste. Genevieve limestone. 

 III. Merrimac group. 



St. Louis limestone. 

 Salem limestone. 

 II. Osage group. 



Warsaw formation. 

 Keokuk limestone. 

 Burlington limestone. 

 I. Kinderhook group. 



Containing many formations more or less local in their geographical 

 distribution. 



Weller has submitted these Mississippian brachiopods to a rigorous, 

 critical study and revision. The method of study by working out the 

 internal anatomy had already been outlined in his paper on the " Internal 

 Characters of some Mississippian Rhynchonelliform Shells. 1 



Since the literature on these fossils has long been in an unsatisfactory 

 and incomplete condition, the revision and redescription of the known 

 forms with the added new species and genera will be welcomed by all 

 students of the fossils of the Mississippian rocks. 



1 Bull. Geol. Soc. Amer., XXI (1910), 497-516. 



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