REVIEWS. 
STRATIGRAPHY OF THE SOUTHERN OZARKS: 
Thickness of the Paleozoic Sediments in Arkansas. By JOHN C. BRAN- 
NER. 7 Am. Jour. Sei., (4), Vol) Il) pps 229-236, 13890: 
Batesville Sandstone of Arkansas. By STuarT WELLER. Trans. 
New York Acad. Sci., Vol. XVI, pp. 251-282, 1897. 
Marine Fossils from the Coal Measures of Arkansas. By JAMES 
PERRIN SMITH. Proc. American Philos. Soc., Vol. XXXV, 
Pp. 213-273, 1897. 
Geological Reconnaissance of the Coal Fields of the Indian Territory. 
By Noaw Fietps Drake. Proc. American Philos. Soc., 
Vol. XXXVI, pp. 326-419, 1898. 
A decade ago one of our most distinguished writers on geology, 
commenting upon the progress of geological investigation in this 
country, drew special attention to the mountainous region of the cen- 
tral Mississippi basin by making the startling statement that that part 
of our national domain about which least was known geologically 
was not in the rugged ridges of the Appalachians nor in the great cor- 
dilleras of the Far West, but in the very heart of the American conti- 
tinent, in a district where mining had long been carried on—in the 
Ozark region. Surprising as was the statement it was literally true. 
Up to that time there had been practically nothing on the geology of 
this region published. ‘There was no place to which one could turn 
for information regarding the geology of a tract of. more than 100,000 
square miles. 
Singularly enough, as if anticipating the full force of the remark 
alluded to, and before the paragraphs had left the press, the states of 
Arkansas and Missouri established geological surveys the express pur- 
poses of which were to solve this very problem. As the result of these 
official activities there have been published by the two states mentioned 
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