Reviews 



Stratigraphy of the Pennsylvanian Series in Missouri. By Henry 



Hinds and F. C. Greene. Missouri Bureau of Geol. and 



Mines, Vol. XIII, 1915. Pp. 407, figs. 5, pis. 32, map 1. 



This volume treats chiefly of the stratigraphy, paleontology, and 



lithology of the barren formations of the Pennsylvanian series in this 



state, thus supplementing Vol. XI, which deals primarily with the coal 



deposits. 



The subdivisions now recognized in the series are given below: 



The formations in this classification are differentiated into 30 mem- 

 bers which might be called formations by those who give the Pennsyl- 

 vanian the rank of a system. The system is markedly unconformable 

 on the beds beneath, and its upper members are the youngest consoli- 

 dated rocks in the state. 



The Des Moines and Missouri groups were differentiated originally 

 with the belief that the latter contained much greater quantities of 

 limestone. The only basis now recognized is a rather well-marked 

 faunal break. There are rather strong indications of a widespread 

 unconformity in the Pleasonton, and this faunal break may be related 

 to it. If this is found to be true the plane between the two groups will 

 be drawn at the unconformity. There has been much confusion in the 

 nomenclature of the Pennsylvanian of this area owing to duplication 

 of names and miscorrelations. That considerable progress has been 



19s 



