Reviezv of Recent Geological Literature. 123 
the lake Superior region, that it is doubtful if it is now possible to 
frame a definition which would not require numerous local modi- 
fications and special adaptations. It is because it is in the literature 
of the United States Geological survey, and in its vagueness was 
made to take the place of formations that had some definiteness that 
it has arisen as a formidable obstacle to the foreign geologist who 
attempts to read American geological reports. n. h. \v. 
Geological Sur-vey of New Jersey, Annual Report of the State Geol- 
ogist for the year 1901. Henky B. Kummel^ Acting State Geologist. 
Pages xxviii and 178, with 7 plates, and a folded map of the geology 
of the Green Pond Mountain Region in Morris and Passaic Counties. 
Trenton, N. J-, 1902. 
The administrative report, in 16 pages, by Mr. Kiimmel, is followed 
by four special reports : I. The Rocks of the Green Pond Mountain 
Region, by Mr. Kimimel and Stuart Weller ; II. Artesian Wells, by 
Lewis Woolman ; III. Chlorine in Natural Waters, by William S. My- 
ers ; and IV. The Mining Industry, by Mr.Kiimmel. It is announced 
that the final report of Prof R. D. Salisbury on the Surface formations 
of the northern part of the state, including the glacial drift area, is 
expected to be published during the present year. Another very im- 
portant report, on the clay industries, is in process of preparation by 
Mr. Kiimmel and Dr. Heinrich Ries. The value of the clays mined 
and sold in 1900 was $467,881, or 25.4 per cent, of the whole for the 
country ; and the output of clay products amounted to $10,928,423, or 
11-36 per cent, of all for the country, the rank of New Jersey being the 
third in the United States. w. u. 
The Story of the Prairies ; or the Landscape Geology of North Dakota. 
By Daniel E. Willard, Professor of Natural Sciences, State Nor- 
mal School, Mayville, N. D. Pages 256, with 83 photogravures, 
drawings, and maps, including a map of the state showing its mar- 
ginal moraines and glacial lakes. Published by the author, 1902. 
Price, $1.75, with 15 cents added for postage. 
This admirable description of the physical geography and the geol- 
ogy of North Dakota is designed for use in the public schools, and for 
its citizens who are interested in its geologic history and resources. 
The drift sheet, its parallel and interlocking belts of moraine hills, the 
flat beds and bordering beaches of the glacial lakes Agassiz, Souris, 
Sargent, and Dakota, the Cretaceous plains and Bad Lands, deposits 
o? lignite coal, artesian wells, etc., are so described as to stimulate 
the readers or pupils to observe and reason for themselves concerning 
the geologic origin and history of these great northwestern prairies 
and plains. w. u. 
An Introduction to Physical Geography. By G- K. Gilbert and A. P. 
Brigham. pp. 380, New York. D. Appleton and Company, June. 1902. 
This excellent treatise was printed so lately that it has an account of 
the volcanic eruptions in May last, in the West Indies, near the mind'e 
of the book. The authors are well known geologists, and they have 
