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CONTENTS. 
JANUARY NUxMBER. 
On a new Specimen of Cladodus clarki. E. W, Claypole. 
[Plates I and II] 1 
The Columbia Formation in Northwestern Illinois. 
Oscar H. Hershey " 7 
The Munuscong Islands, F.B.Taylor. [Illustrated.]. 24 
The Age of the Galena Limestone. N. H. Winchell. ... 33 
Acid Eruptives of Northeastern Maryland. Charles 
RoLLiN Keyes 39 
Editorial Co«tme?if. — State Academiee of Science, 46. 
Revieio of Recent Geological Literature. — The Thirteenth Annual Re- 
port of the U. S. Geological Survey, J. W. Powell, Director, 48. — 
Sulla serpentina d'Oira (Lago d'Orta) e sopra alcune roccii adessa 
associate, Francesco Sansi, 49. — The Geological History of Roch- 
ester, N. Y., H. L. Fairchild, 50. — The Length of Geologic Time, 
H. L. Faircuild, 51. — Preliminary Report of Field Work during 
1893 in Northeastern Minnesota, chiefly relating to the Glacial 
Drift, Warren Upham, 51. — The Lherzolite-serpentine and asso- 
ciated rocks of the Potrero, San Francisco, Charles Palache, 52. 
— On a Rock from the vicinity of Berkeley containing a new Soda 
Amphibole, Charles Palache, 52. — The Great Ice Age and its Re- 
lation to the Antiquity of Man, James Geikie, 52. — The Ore De- 
posits of the United States, James F. Kemp, 57. — The Geology of 
Angel Island, F. L. Ransome, 57.— Geological Survey of Missouri, 
Sheets Nos. 2 and 3, Arthur Winslow, 58. — Geological Map of 
Alabama, with an Explanatory Chart, Eugene A. Smith, 58. — The 
Geological History of Harbors, N. S. Shaler. 59. — The Mechanics 
of Appalachian Structure, Bailey Willis, 60. — The Average Ele- 
vation of the United States, Henry Gannett, 62. 
Correspondence. — Remarks on the Berner Oberland sections of Prof. 
H. GoUiez in the Geological Handbook of Switzerland. 1894, A. 
Baltzer, 62. — Inequalities in the old Paleozoic Sea Bottom, J. E. 
Todd, 64. 
Personal and Scientific jVews. — Baltimore Meeting of the Geological 
Society of America, 64. 
FEBRUARY NUMBER. 
George Huntington Williams. John M. Clarke. [Por- 
trait.] 60 
The Geologic History of Missouri. Arthur Winsloav... 81 
A new Cretaceous genus of Clypeastridjv?. F. W. Craoix 90 
Further observations on the Ventral Structure of Triar- 
thrus. C. E. Beeciiek. [Plates IV and V.] 01 
The Second Lake Algonquin. F. B. Taylor. [Plate VI.] 100 
Editorial Com)iient. — An amusing error, 120.— The fossil Fishes of 
Canon City, Colorado, 121. 
I'D S.'o^ 
