i\ ' 'ontents. 
Geological and Topographical Features of the Region 
about Atlanta, Georgia. C W. Pukinoton. [Plate 
IV.] 105 
Editorial Comment - The Columbian Exposition, some special State 
exhibits of the crystalline rocks. 108. 
Revieiv of Recent Geological Literature. — Twelfth Annual Report of 
the U. S. Geological Survey, J. W. Powkll, 113. — The Origin and 
Nature of Soils, N. S. Shaler, 111. — The Lafayette Formation, W 
J McGee, 115. — The North American Continent during Cambrian 
Time, C. D. Walcott. 116. — Eruptive rocks of Electric peak and 
Sepulchre-mountain, Yellowstone National Park, J. P. Iddings, 117. 
— Popular Lectures and Addre6sep. Baron Kelvin, lis. — Manual 
of the Study of Documents. Persifor Frazfb, 118. — Die Fauna 
des unteren Devon am Ostabhange des Ural,TH. Tsohernyschew, 
119. — Eighteenth Annual Report, for 1893, Indiana, Department of 
Geology and Natural Resources. S. S. Corby, 125. 
Recent Publications, 12G. 
Correspondence. — Trilobites in the "Oil Rock" Horizon of the Trenton 
limestone, Wm. P. Blake, 133. — The Rock Basin of Cayuga lake, J. 
W. Spencer, 134. — The Age of Niagara Falls, J. W. Spencer, 13."). 
Personal and Scientific News. — Death of Prof. G. H. Williams, 136. — 
Kansas State University, 136. 
SEPTEMBER NUMBER. 
Cladodus ? magnifies, a new Selachian. E. W. Clay- 
pole. [Plate V.] 137 
The Niobrara Chalk. Samuel Calvin 140 
Summary of facts proving the Cambrian age of the 
white limestones of Sussex county, New Jersey. 
Frank L. Nason. [Illustrated.] 161 
The Elk Horn creek area of St. Peter sandstone in 
northwestern Illinois. Oscar H. Hershey. [Il- 
lustrated. ] 169 
History of Instruction in Geology and Palaeontology 
in German Universities. Karl A. von Zittel 
(translated by C. R. Eastman) 179 
Editorial Comment. — "The Mineral Industry." 185. 
Revieiv of Recent Geological Literature. — Illustrations of the Fauna of 
the St. John grr..up. No. vni. G. F. Matthew, 187.— Contribution 
to the Knowledge of the Preglacial Drainage of Ohio, W. G. 
Tight. 188. — Nepheline Syenite in th« township of Dungannon, 
Ontario.!". D. Adams, l^'.i.— Second Expedition to Mt. St. Elias, 
in 1891. I. C. Rl'ssell. 191). — On certain Astronomical Conditions 
favorable to Glaciation. G. F. Becker, 191. 
Correspondence. — A Reply to "Causes and Conditions of Glaciation.'' 
Maksden Manson, in:?.— Lake Cayuga a Rock Basin. R. S. Tarr. 
104. 
Personal and Scientific News. — The Summer Meeting of the Geological 
Society of America, with notes of papers, 105.— Brooklyn Meeting 
of the American Association for the Advancement of Science, with 
notes of papers, 202. 
