EBRfclARY, 1859,. VOL. 1 i. > 
THE 
AMERICAN 
GEOLOGIST. 
I , A MONTHLY JOURNAL OF 
GEOLOGY AND ALLIED SCIENCES. 
EDITORS AND PROPRIETORS: 
Prof. Samuel Calvin, University of Iowa, Iowa City , Iowa , 
Prof. Edward W. Claypqle, Buchtel College, Akron, O. 
Dr. Persifor Frazer, Franklin Institute, Philadelphia, Penn. 
Dr Lewis E. Hicks, University of Nebraska, Lincoln, Neb. 
Mr. Edward O. Ulrich, Geol. Survey of Illinois, Newport, Ky. 
Dr. Alexander Winchell, University of Michigan, Ann Arbor, Mick. 
Prof. Newton H. Winchell, University of Minnesota, Minneapolis, Minn. 
iijgl? flumbsrs, 35 Qeijts. Yearly Subscription, $3.50. 
QOfJs 
PAGE 
LACIER8 AND GLACIAL RADIANTS OF THE 
ice age. Dr. E. W. Claypole .......... 73 
[OTES UPON THE WavERLY GROUP IN OHIO 
[Illustrated]. C. L. Herrick. ........... 94 
'gssil wood and lignites of the Potomac 
formation. F. H, Knowlton .......... 99 
’HYSICAL THEORIES OF THE EARTH IN RELA¬ 
TION TO MOUNTAIN FORMATION. T. 
Mellard Reade .. 106 
'he Chouteau group of eastern Mis- 
i sour 1. R. R. Rowley ................. Ill 
'HE ARTESIAN WELL AT ClTY PARK, DAVEN- 
port, Iowa. A. S. Tiffany ............ 117 
•ARRANDE AND THE TaCONIC SYSTEM. 
Jules Marcou. ............_...._ 118 
Editorial Comment. 
A new glacial theory.................. 138 
The Geological Society of America.... 140 
iPAGTSS 
Review of recent literature.. 146 
Useful minerals of the^United States. 
Albert Williams Jr. 148—The visual area 
of the trilobite Phacops ran a. John M. 
Clarke , 146—Geological survey of the 
state of New York, James Hall . 147.— 
The attachment of Platyceras to crinoids. 
C.' R. Keyes, 148.—The American An- 
thropologist, 149—Relations of Homos- 
teus and Coccosteus, Traquair , 149-Pres¬ 
sure as a factor in metamorphism. Hark- 
er , 150—More fossils in the Lower Cam¬ 
brian of North Wales, ! 7 . McK. Hughes, 
150—Ueber die eruptive Natur gewisser 
Gneiss© sowie des Granulits im sachsi- 
schen Mittelgebirge, E. Danzig, 151. 
Personal and Scientific News ... ; „... 159. 
THE AMERICAN GEOLOGIST, MINNEAPOLIS. 
Jenerai European Agent, W, P. Collins, 157 Great Portland St., London W. Eng. 
Entered at the Minneapolis post-office as second-class matter,. 
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