266 Tlic American Geologist. April, i899 
Winchell, N. H. 
Common zeolites of the Minnesota shore of lake Superior. (Am. 
GcoL, vol. 22>, pp. 176-177, Mch. 1899.) 
Wolff, J. E., and Brooks, A. H. 
The age of the Franklin white limestone of Sussex county, New- 
Jersey. (i8th Ann. Rept. U. S. Geol. Survey, pt. 2, pp. 425-457, pi. 
83, 1898.) 
CORRESPONDENCE. 
Dr. Hovev's report of the late Meeting of the Geological 
SociETY.-The accuracy of the statement in the second paragraph on p. 
Q9 of my report of the recent meeting of the Geological Society of America 
having been called in question, I have been called upon to state the 
authority upon which the remarks were made, as a matter of justice to 
all concerned. I was detained elsewhere during the reading of Messrs. 
.McGee and Holmes' papers on " The Geology and Archaeology of Cal- 
ifornia" and the discussion upon them, and therefore Mr, McGee very 
kindlv furnished me the abstract of those papers and the discussion 
thereon, and it was published verbatim in the American Geologist. This 
explanation is made with the consent of Mr. McGee. 
E. O. HOVEY. 
The Duplication of Geologic For.mation Names. — The cus- 
tom of giving more or less local geographic names to geologic subdi- 
visions has become so universal that we are even now duplicating the 
use of such names to a considerable extent. Geological literature is of 
too great bulk for the working ge(»logist to attempt to ascertain whether 
or not names which he proposes to use have been preoccupied. To il- 
lustrate what the present system is leading to a few instances of some 
prominence will be cited. 
In 1883 Hague described, in a report of the U. S. Geological Survey, 
the Eureka quartzyte, a subdivision of the Silurian, in the Eureka dis- 
trict, Nevada. In 1891, Simonds and Hopkins, in a report of the Arkan- 
sas Geological Survey, used the name Eureka shale for a supposed De- 
vonian horizon; while in 1898 Haworth, in a report of the Kansas Geolog- 
ical Survey, proposes the name Eureka limestone as a subdivision of the 
Coal Measures. 
In 1879, Peale, in the nth Annual Rejjort of the U. S. Geological 
and Geographical Survey of the Territories, employed the term Cache 
\'alley Group for a subdivision of the Pleistocene of Utah. Becker de- 
scribed in 1888 the Cache Lake beds of California, in Monograph 
XIII of the U. S. Geological Survey, and referred them to the Tertiary. 
In 1896 G. M. Dawson, in a report of the Canada Geological Survey, 
uses the name Cache formation for a horizon of the Carboniferous to 
