Contents. v 
Personal and Scientific News. — Personal items, 206. — Pood habit of 
plesiosaurs, 206. — African lakes, 207. — Glacial erosion of lake ba- 
sins of rock, 207. — Eozoon-like structure in ejected blocks of Monte 
Somma, 208. — Sixth Annual Meeting of the Geological Society of 
America, notes of papers (concluded), 208. 
APRIL NUMBER. 
On a new Horizon and some new Localities for friable 
sandstone in which the grains are enlarged by Sec- 
ondary Deposition of Silica in optical continuity 
with the original nucleus. S.Calvin. [Plate VI.]. 225 
Geological Notes on the Sierra Nevada (Part I). H. W. 
Turner 228 
A Classification of Economic Geological Deposits based 
on Origin and Original Structure. W. O. Crosby. . . 249 
Geology of Jefferson county, Texas. W. Kennedy 26S 
British Drift Theories. Warren Upham 275 
Editorial Comment. — The Columbian Exposition: The Harvard Uni- 
versity Geological Exhibit, 279. 
Review of Recent Geological Literature. — Flora of the outlying Car- 
boniferous basins of southwestern Missouri, David White, 283. — 
Lichas (Uralichas) ribeiroi, J. P. N. Delgado, 284. — Un nouveau 
Eurypterus du Rothliegendes de Bussaco (Portugal), W. de Lima, 
284. — Age of the Newark brownstone, B. S. Lyman, 284.— Coal 
Measures of Blount mountain, Alabama, A. M. Gibson, 284. — 
Diamonds in meteorites, O. W. Huntington, 284. — Conversion of 
chlorite into biotite in rock-metamorphism, Chas. Callaway, 285. 
— Basalts of Kula, H. S. Washington, 285.— Chemical composition 
of Staurolite, and the regular arrangement of its carbonaceous 
inclusions, S. L. Penpield and J. H. Pratt, 285. — Continuity of 
the Glacial period, G. F. Wright, 286. 
Correspondence. — Composite Generic Fundamenta, J. M. Clarke, 286. 
"The Columbian Exposition: Notes on some Mesozoic and Ter- 
tiary Exhibits," T. W. Stanton, 289. 
Personal and. Scientific News, 291. 
MAY NUMBER. 
A Multiple Diabase Dyke, Andrew ('. Lawson. [Plate 
VII.] 293 
Geological Notes on the Sierra Nevada (Part II). II. W. 
Turner 297 
A Reconnaissance of the Abandoned Shore Lines of Green 
Bay. F. B. Taylor. [Illustrated.] 816 
American Species of Autodetus and some Paramorphic 
Shells from the Devonian. John M. Clause. [Illus- 
trated.] 327 
The Iron Ores of the Mesabi Range. J. E. Spukr. | Plate 
VIII. ] 335 
The Columbian Exposition: Notes on Various Exhibits 
relative to Mineralogy and Petrography. Geobge II. 
Williams 345 
