REVIEWS 665 



Lying above the beds carrying the strikingly Devonian fauna of the 

 Upper Monroe, is the Lucas dolomite, the youngest member of the 

 series, in which the fauna is Silurian in aspect throughout. 



In their correlation of the Monroe series the authors adopt a new 

 arrangement of the North American Silurian formations, as follows: 

 (1) Lower Silurian or Niagaran, (2) Middle Silurian or Salinan, (3) Upper 

 Silurian of Monroan. The Lower Monroe is said to be unrepresented 

 in either western or eastern New York, but is correlated with the so- 

 called "Salina" and the lower portion of the Corrigan formation of 

 Maryland. The lower portion of the Upper Monroe is correlated with 

 the Bertie waterlime and Akron dolomite of western New York, and with 

 the Rosendale waterlime and Cobleskill of eastern New York. An 

 equivalent of the Lucas dolomite is wanting in western New York but 

 it is represented by the Rondout and Manlius of eastern New York and 

 by the Corrigan formation of Maryland. 



In a discussion of the paleogeography of Monroe times it is suggested 

 that the faunas of Silurian aspect in the Lower Monroe and in the Lucas 

 dolomite have had an Atlantic origin, while the faunas with the notable 

 Devonian expression in the Upper Monroe below the Lucas dolomite 

 have come in from the north. 



S. W. 



The Fossils and Stratigraphy of the Middle Devonic of Wisconsin. 



By Herdman F. Cleland. [Wisconsin Geological and 



Natural History Survey, Bulletin No. XXL] 

 The Devonian faunas occurring in the neighborhood of Milwaukee 

 and Lake Church, Wisconsin, are of especial interest to students of 

 Paleozoic historical geology because of their intermediate geographic 

 position between the much better known Devonian faunas of New York 

 and of Iowa. The present report by Dr. Cleland records a complete 

 census of these faunas with detailed descriptions of the species, accom- 

 panied by fifty-three plates of illustrations. Something over 200 species 

 are recognized. Of the total number of species 81 occur in Devonian 

 faunas east of Wisconsin, mostly in New York, while 48 species occur 

 in the Devonian of Iowa and other localities to the west. This mingling 

 of the eastern and western faunas of late Middle and early Upper Devo- 

 nian time in the Milwaukee region has been pointed out before, but here 

 for the first time do we have a full statement of the evidence. 



S. W. 



