AMERICAN JOURNAL OF SCIENCE. 
[THIRD SERIES.] 
Art. XXIX. — Recent Explorations in the Wappinger Valley 
Lnmestone of Dutchess County, New York ; by Prof. WILLIAM 
B. Dwieut, Vassar College, Poughkeepsie, N. Y. With 
Plate VIL. ‘ 
No. 4.—Derscrirtions or Carcrrerovs (?) Fossirs. 
In a previous paper of this series, four years ago,* the writer 
made known his identification of Calciferous, as well as Tren- 
ton rocks, in the limestones of the Wappinger Valley. This 
determination was founded on the presence of the ordinary but 
very unsatisfactory fossils considered characteristic of the Cal- 
ciferous in the United States. 
ne year later announcement was made, in a brief note,t of 
his further discoveries, in the same apparently Calciferous stra- 
tum, of fossils far more striking and important. These were 
Stated to be gasteropods and one or two small brachiopods, 
accompanying orthoceratites lying crowded together, in some 
localities, and in much variety of structure and of size, reach- 
ng in some cases a length of 9 inches, and in others a width 
1 
_. The long interval which has followed without the publica- 
tion of the details in this series of papers has been unavoidably 
due to the extent of the problems, and of the work, thus sud- 
denly and unexpectedly presented. The question of the true 
age of the stratum was at once re-opened; new, careful and 
extended exploration for all attainable facts was imperatively 
* This Journal, January, 1880, + This Journal, January, 1881. 
: Am, Jour. pb teape Series, Vou. XXVII. No. 160.—Aprit, 1884. 
4 ‘ * it 
