Review of Recetit Geological Literature. 65 
the last a marked advance has been made, due largelj' to the work of 
Messrs. Calvin and Bain. A summary staterhent of the results of their 
study of the drift deposits has already been given in this journal (Vol. 
XIX, pp. 270-272, April, 1897). 
The present volume contains reports on six counties, each report 
being accompanied by two maps, one showing the pre-Pleistocene and 
the other the Pleistocene geology, but the latter map is omitted in the 
report on Madison county. These county reports are as follows: John- 
son and Cerro Gordo counties, by Samuel Calvin; Marshall county, by 
S. W. Beyer: Polk and Guthrie counties, by H. F. Bain; Madison 
county, by J. L. Tilton and H. F. Bain. The reports on Johnson and 
Polk counties have already been reviewed in this journal (Vol. XX, p. 
273, Oct., 1897; Vol. XX, p. 334, Nov., 1897). 
A geological map of the state is presented which shows the outlines 
of the following divisions: Algonkian, Cambrian, Ordovician, Silurian, 
Devonian, Mississippian, Des Moines, Missourian and Cretaceous. This 
map is more accurate than those formerly published, as must necessarily 
be the case as the detailed work of the survey is extended. The limits 
of the Cretaceous are more carefully defined and the rocks of this 
system are found to cover considerably more territory than was sup- 
posed a few years ago. The same increase in the known geographical 
limits of the Cretaceous is also evident in the later reports of the 
Minnesota survey. u. S. G. 
Volcanoes of N^orth America: a reading lesson for Students of Ge- 
ography and Geology. Israel t. Russell. New York. The Mac- 
millan Company, 1897. Octavo, 346 pages, S4.00. 
This review is quite similar in scope and plan to the former works 
of the same author on the lakes and on the glaciers of North America. 
It opens with a chapter on the characteristics of volcanoes, occupying 
126 pages, in which Stromboli, Vesuvius, Krakatoa, the Hawaiian 
islands and the lava fields of the Deccan and of Columbia are taken as 
types, to which is added also a note on the trap-rocks of the Newark 
system, the last being the most recent of the volcanic epochs of the 
Atlantic side of North America. , 
The author is responsible for many of the descriptions here given, 
having examined several of the most important volcanic, regions of 
North America, but he has compiled from others many other descrip- 
tions, some being from the reports of the United States Geological 
Survey, and from the Geological Survey of Mexico. Great value is 
added to the work by the fine illustrations with which it is accompanied. 
The volume is a welcome addition to the geological literature of North 
America, and serves to supply for America what those of Scrope and 
of Geikie have given to the geology of Europe. 
Without attempting a thorough review, attention may be called to 
the lack of mention of recently extinct volcanoes in New Mexico, and 
even in Texas, further east than has been allowed by the author. He 
specifically excludes some, which have been enumerated more recently 
