iv Contents. 
Observations on the vertical range of certain species of 
fossils of the Hamilton period in western Ontario. 
S. Calvin 8i 
A short history of the origin and acts of the International 
Congress of Geologists, and of the American com- 
mittee delegates to it. [n]. Persifor Frazer. . . 86 
■■ A correlation of the Lower Silurian horizons of Tennessee, 
and of the Ohio and Mississippi valleys with those of 
New York and Canada, [i.] E. O. Ulrich loo 
F. V. Hayden,M. D. LL.D. E. D. Cope. [Portrait.] no 
Editerial Comment. — Murra3''s theory of the formation of barrier reefs 
and coi-al island, 113. — On the chert of the Upper Coal Measures in 
Montgomery county, Iowa, 117. — The new geological map of Europe, 
117. — Bulletin of Denison University, 117. 
Revieiv of recent literature. — Is there a Huronian group? Irving, 119. — 
Sand-boulderst in the drift or subaqueous origin of the drift'in cent- 
ral Missouri, J. W. Spencer, 120. — On the organic origin of chert in 
the Carboniferous limestone series of Ireland, G. J. Hinde, 121. — 
Annual report of the department of mines. New South Wales, 
Harrie Wood, 122. — Geology of the Vegetable creek tin-mining field. 
New South Wales. T. W. Edgeworth David, 122. — Preliminary 
paper on the driftless area of the upper Mississippi valley, Cham- 
BERLiN and Salisburj', 122. — Fulgurite from Mt. Thielson, Peri- 
dotyte from Kentucky. Notes on the geology and the latest vol- 
canic eruption in N. California, J. S. Diller, 125. Ovibos cavifrons, 
W. J. McGee, 126. — Report of the state geologist of N. Y. Hali., 
127. 
Ne-'j publications.! 1 28. 
Correspondence., 129. 
Personal and Scientific JVetvs, 1 32. 
MARCH NUMBER. 
Some effects of pressure of a continental glacier. Alex- 
ander WiNCHELL 139 
The river-lake system of western Michigan. C. W. 
WOOLDKIDGE I43 
A new post pleiocene limnieid. R. Ellsworth Call . 146 
Notes on the fossils of the loess at Iowa City. B, Shimek. 149 ♦ 
Darwin and geology, [i]. E. W. Claypole 152 
Some objections to the term Taconic considered. N, H. 
WiNCHELL 163 
Anthracite coal in the valley of the Bow river. Northwest 
Territory of Canada. James A. Dodge 172 
A great primordial quartzyte. N. H. Wincheli 173 
fTpi. correlation of the Lower Silurian horizons of Tennessee 
and of the Ohio and Mississippi valleys with those of 
New York and Canada. [ 1 1 ]• E. O. Ulrich .... 1 79 
vSingular subterranean commotion near Akron, Ohio. E. 
W. Claypole 190 
