Geology and Mineralogy, ' 315 



this report are of especial economic value to this and neighbor- 

 ing States, including as they do reports on the " Salines of Norlh 

 Louisiana," A. C. Veatch, "Subterranean Waters of Louisiana" 

 and " Oil in Louisiana," by G. D. Harris. 



The map of the Mississippi Embayment shows the Jackson 

 Stage for the first time with its most probable northern distribu- 

 tion. The statement with regard to the close of the Cretaceous 

 is of interest at this time because of its importance to the oil 

 industry : " In Louisiana we have reason to believe that the rais- 

 ing and depression of the Cretaceous beds was of a much more 

 violent nature [than farther north], that folds and faults were 

 numerous and on a large scale and a great irregularity of surface 

 feature characterized the newly formed rocks." Professor Harris 

 differs from R. T. Hill and others who believe that there are no 

 " structural complications " in this formation. 



Doubt is thrown on the usually accepted theory concerning 

 the origin of the "Mud Lumps" of the Mississippi. No new 

 theory is advanced, but the statement is made that, "that they 

 rise in domes or anticlines and preserve their regular bedding is 

 proven by their structure." " So far as we observed, none were 

 formed as volcano-like cones." 



The report on the Salines of North Louisiana, A. C. Veatch, 

 contains a history of the earlj^ operations of the various salt wells 

 and licks together with well sections and a discussion of the 

 geology. It is shown that "the principal brine springs are to 

 be regarded as Cretaceous outcrops." The dome structure of 

 these and other north Louisiana Cretaceous outcrops is accepted. 

 The maps of this report and of Reports HI and IV are excellent. 



The Reports on the Geography and Geology of the Sabine 

 and Ouachita Rivers contain discussions and explanations of the 

 "landslip islands" of the Ouachita River and the shoals of the 

 Sabine River which are of especial interest to physiographers. 



One of the most valuable reports, economically, is that on the 

 Subterranean Waters of Louisiana. 



It is to be regretted that a volume containing so much valuable 

 matter and so well illustrated by maps and half-tones is not 

 printed on better paper and bound more substantially. 



3. Die Alpen hn Eiszeitalter ; von Albre-cht Penck und 

 Eduard Bruckner. Parts 1 and 2. 224 pp., with many charts 

 and figures. Leipzig. (Tauchnitz.) — After fourteen years of 

 investigation Professors Penck and Bruckner have begun the 

 publication of their views regarding glaciation in the Alps. The 

 completed work will consist of about six parts, dealing with the 

 entire Alpine system throughout the Pleistocene with especial 

 reference to the topography resulting from ice action. In the 

 two parts already issued Professor Penck discusses the general 

 chararter of glaciers and of glacial deposits, and explains with 

 gr< at detail the glacial phenomena of the northern and eastern 

 Alpine border region, particularly the area between the Iller and 

 the Lech. 



