VI ( 'mi 1 1' ills. 
The Pleistocene Roek Gorges of northwestern Illinois. 
Oscak II. Hershey. [ [Ilus.trated. | 311 
Editorial Comment. — The Columhian Exposition, The Standard Oil 
Company's exhibit of Petroleum, '.VI'-). — Professor Hyatt's Rejoin- 
der, 320. 
Review of Recent Geological Literature. — Notes on some Fossil plants 
from the Trinity division of the Comanche series of Texas, W. M. 
Fontaine, 327. — The Flora of the Dakota Group, Leo Les^ukr- 
bdx (edited by F. H. Knowlton), 328. — Gasteropoda and Cephalop 
oda of the Raritan Clays and Greensand Marls of New Jersey, 
R. P. Whitfield, 329. — Cretaceous Fossil plants from Minnesota. 
Leo Lesquereux, o30. — The Microscopic Faunaof the Cretaceous 
in Minnesota, with additions from Nebraska and Illinois, A. Wood- 
ward and B. W. Thomas, 330. — Sponges, Graptolites and Corals 
from the Lower Silurian of Minnesota, N. H. Winchell and C. 
Schuchert, 331. — On Lower Silurian Bryozoa of Minnesota, E. O. 
Ulrich, 331.— The Lower Silurian Brachiopoda of Minnesota. N. 
II, Winchell and C. Schuchert, 332. — British Pala?ozoic Phyllo- 
poda, T. R. Jones and H. Woodward, 332.— Sveriges Kambrisk- 
siluriska Hyolithidai och Conulariid;e, G. Holm. 334. — Larval forms 
of Trilobites, C. E. Beecher, 334. — Devonischen Fauna des Altai's, 
Th. Tschernysohew, 335. — Protospongia rhenana, C. Schlutkk. 
335. — Palaeosaccus Dawsoni, G.J. Hinde, 335.— Rouvilligraptus, 
C. Barrois, 330.— Surface Geology of New Jersey, 1892, R. D. Sal- 
isbury, 330. — Iowa Geological Survey, vol. i, S. Calvin and C. R. 
Keyes, 337. — Geology. A. J. Jukes-Browne, 339. 
< 'orrespomlence.- The Reproduction of Arms in Crinoids, A.F.Foerste. 
:;i(). -Additional Models at the Fair, W. M. Davis, :S40.— The St. 
John Group, G. F. Matthew, 340. 
Personal and Scientific News, 341. 
DECEMBEE NUMBER. 
Geologic Time; as indicated by the Sedimentary Rocks 
of North America. Charles D. Walcott. [Plate 
XV. | 343 
The Origin of Parallel and Intersecting Joints. W. O. 
Crosby * 368 
Editorial Comment.— The Columbian Exposition, A hasty glance taken 
in August, 1893, at the ores of the noble and of the useful metals 
in the Mines and Mining Building, 370. 
Reviewof Recent Geological Literature. — Development of the Brachial 
Supports in Dielasma and Zygospira, Charles E. Beecher and 
Charlbs Schuchert, 394. — Trematobokis: An Articulate Brach- 
iopod of the Inarticulate Order, G. F. Matthew, 390.— Outline of 
the geological and physical features of Maryland, George H. Wil- 
liams and William B. Clark, 390. — Correlation Papers of the U. 
S. Geol. Survey: Cretaceous, Charles A. White, 398; Eocene. 
William B.Clark, 399; Neocene, William H. Dall and Gilbert 
D. Harbis. 399; The Newark System, Israel C. Russell, 402. 
Correspondence.- Origin of Peconic bay and of the Shinnecock hills, 
John Bryson, 402. 
Personal and Scientific News. — Meeting of the National Academy of 
Sciences, 401. Miss Maria Ogilvie, 404. 
