Review of 'Recent Geological Literature. 329 
as accepted by Messrs. Walcott and Marcou is that of the upper Mississ- 
ippi valley, and there is, as jet, no evidence to prove that it is found in 
the Potsdam of New York. On the other hand if that evidence which 
exists be heeded, the New York Potsdam would be placed in the middle 
primordial zone. The paper also reviews the report on the geology of 
Vermont, and the classification of Messrs. E. and C. \\. Hitchcock, es- 
pecially with reference to its date of publication, and that of some of its 
parts, and brings out fully the unfriendly opposition of the report toward 
both Emmons and Marcou as well as toward the Taconic sj'stem. 
RECENT PUBLICATIONS. 
I. State and Govcminient j-cporfs. 
Geological survey of New Jersey; Annual report of the state geologis; 
for the year 1887. 45 pp. one map, George H. Cook. New Brunswick* 
The gabbros and associated hornblende rocks occurring in the neigh- 
borhood of Baltimore, Md.; George Huntington Williams. Bulletin 
No. 28 of the U. S. Geological Survey Washington. 
Seventh annual report of the state mineralogist for the year ending 
October i, 18S7. William Irelan, State Mineralogist, S vo., 315 pp. Sac- 
ramento, Cal. 
2. Proceedings of scientific societies. 
In the Transactions of the Field-Naturalist Club. March 1888. On 
Utica fossils from Rideau, Ottawa, Ont. Henry M. Ami. Notes on 
geological work during the summer of 1887. Mr. John Steivart. Re- 
port of the Geological Branch for the season of 1887. Ottazva, 
Archieology of Ohio. 8 vo., 119 pp. M. C. Read. The Western Re- 
serve Historical Society. 
Proceedings and transactions of the Nova Scotian institute of natural 
science of Halifax, Nova Scotia, 1SS6 — 87. 
J". Papers in scientific journals. 
In the March number of the American Jotirnal of Science. On the so- 
called Northford, Maine, Meteorite F. C. Robinson. History of the 
changes in the Mt. Loa craters. James D. Dana. The Taconic system 
of Emmons, and the use of the name Taconic in geologic nomenclature. 
C. D. Walcott. With one plate. On the crystalline form of polianite. 
E. S. Dana and 6". L. Pen field. 
In the February number of the American Naturcdist. On meteorites. 
Dr. Hans Reusch. 
In tJie April number of the American Journal of Science. History of the 
changes in the Mt. Loa craters. J. D. Dana. Notes on certain rare 
copper minerals from Utah. W. F. Hillebrand and H. S. Washington. 
The Taconic System of Emmons and the use of the name Taconic in 
geologic nomenclature. C. D. Walcott. Three formations of the middle 
