1893. | NEW YORK ACADEMY OF SCIENCES 109 
DIVISION 3, OR BRETONIAN STAGE. 
Black shales alternating with dark gray shales, 
The same as the last, but finer. 
Black carbonaceous shales. 
Same as the last, fauna unknown. 
. Similar shales, with a few sandy seams. 
Seana a! 
In Band 6 of Division 1, has recently been found a consider- 
able fauna of Lower Cambrian age. Bands c and d of the same 
division contain the Paradoxides or Middle Cambrian fauna, 
while Division 2 and part of Division 3 appear to correspond 
with the Upper Cambrian of the United States. The upper 
part of Division 3 is of Lower Silurian age. 
OccuRRENCE oF THE Noputes.—The phosphate nodules occur 
at Hanford Brook, near the eastern end of the southern basin, 
in Division 1b, which is here subdivided into the following 
zones : . 
1. Dark gray sandstone, - - - 40 feet 
2. Dark gray sandy shales, - - =U tet; 
3. Hard, purple streaked gray sandstones, 30 ‘‘ 
4, Olive gray shale, - - . =I a0, 
5. Gray sandy shale, - - - - 20 ** 
In Zone 2 there is a layer of nodules about 2” thick, and they 
also occur scattered through the hard sandstones of Zone 3. 
They are of considerable importance to the paleontologist, as 
it is chiefly in and near them that the Lower Cambrian fossils 
have been found. 
Derscriprion.—The layer in Div. 1b? consists of small, round 
or oval nodules, averaging about %" in diameter, bluck and 
comparatively soft, and set in a matrix of soft, green, coarse- 
grained sandstone, which fades out irregularly into the finer 
gray sandy shales. Those of Diy. 1b° are larger, more irregular 
in shape, and much harder, and do not break out of their 
matrix as do the smaller ones. The latter have almost always 
a trilobite test, or a number of trilobite fragments, at or near 
the centre ; the larger ones are generally barren of trilobites, 
though such as do occur in this zone are mostly associated with 
them. These nodules are conspicuously seen on the surfaces of 
the great blocks of sandstone which have fallen down from the 
steep bank of the brook; they are also, however, sparsely 
seattered all through the mass of the rock, and in the upper 
part are more numerous, and are often fused and run together 
in masses of larger size, up to 3” or 4” in diameter. 
