REVIEWS 
A Preliminary Report on the Geology of Lowstana. By GILBERT D. 
Harris, geologist in charge, and A. C. VrEarcu, assistant 
geologist. Made under direction of State Experiment Sta- 
HON) batonmNouce seam Vim Cr Stubbs Eh De director: 
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This report is divided into three sections: I, Historical Review ; 
II, General Geology, and III, Special papers. 
In view of the important disagreements between the earlier writers 
upon Louisiana geology and the authors of this volume the historical 
review with which it opens is especially important and interesting. 
The full meaning of this review is only clear after one reads the second 
part and some of the third part of the volume. The lowest horizons 
represented are Cretaceous, and the earlier determination of these beds 
séems to have been based upon the occurrence of a single species, 
Lixogyra costata. The present survey has been able to get together a 
a fairly good representation of the Cretaceous fauna of the state (p. 
292-297). 
The Mansfield of Hilgard, which was referred by Hopkins to the 
Jackson (p. 29-35) at the top of the Eocene, turns out to be Lower 
Lignitic Eocene (pp. 64-73), a horizon not hitherto known to exist 
in Louisiana. The conclusions reached in regard to the Cretaceous 
give us a new view of the general geology of the state. The dips and 
many other facts cited “indicate northeast-southwest local folds paral- 
lel to the old shore lines,” rather than a northwest-southeast mountain 
chain (p. 62.) Of the Vicksburgh beds which some of the earlier 
writers thought they had found between Red River and the Sabine, 
Professor Harris says ‘‘we have found no trace of Vicksburg deposits 
west of Red River” (p. 90). 
A part of the second section of the report is devoted to Economic 
Geology, and under this head are given valuable data regarding the 
salt, sulphur, and clay deposits of the state. Among the special 
reports are several of more than unusual interest. One of these is Mr. 
Veatch’s paper upon ‘‘The Shreveport Area.”’ Under this head he 
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