CHAMPLAIN DIVISION. 
407 
slate is underlaid by a series of alternating layers of slate and limestone. The limestone is 
compact, blue and grey. This stratum is represented on the section by (a). 
Next above the slate that is quarried, is a stratum of the conglomerate and breccia lime¬ 
stone. It is composed of nodular and irregular masses, cemented by slaty matter like that 
in the stratum below. The limestone is dark blue and compact, and the slaty matter is greyish. 
Fine lines and veins of white carbonate of lime traverse the mass. This rock seems adapted 
to make a good marble, where very heavy, massive blocks are required. In consequence of 
the subjacent slate having been quarried out, the limestone has fallen down in huge blocks 
from a ton to twenty and thirty tons weight each; and the masses are of the thickness of the 
strata, or three to four feet thick, and bounded on their sides by the natural joints of the rock. 
The quarries are extensive along the shore, and the limestone has tumbled down in immense 
quantities. 
Various modifications of this limestone form a bed twenty to forty feet thick, and over this 
is a slate rock {d ); and still above a crystalline calciferous grit rock, probably belonging to 
the Calciferous group.* The limestones were traced south a full mile, receding from the river 
after the road strikes the upper marsh. 
2. Strata nearly similar to those described, and some others, were finely exposed at Stock- 
port landing by blasting for the wharf and warehouses. These localities, and Great Neuten 
hook, are recommended to students of geology as suitable places to examine the conglomerate 
limestone and some of the associated rocks. 
3. On the southwest and northwest shores of Great Neuten hook, some of the rocks of the 
lower part of the Champlain division are well exposed to view. The strike of the rocks is 
generally about N. 10° to 20° W., and the dip about twenty degrees to the eastward; but on 
the southwest part of the hook, the rocks on the shore exhibit an inverted arch, on a scale 
sufiiciently large to be distinguished on board the steamboats as they pass, but it may be 
much more satisfactorily seen by being on the shore. It is represented on Plate 24, fig. 2. 
The slate underlying the inverted arch, on the right hand side of the figure, is bent, twisted, 
knotted and fissured in every direction. 
The following section is along the shore farther north on the hook, extending from near the 
house in the cove toward the west and southwest. The observer is supposed to face the south 
(Vide Plate 24, fig. 3). 
* The conglomerate at this locality belongs to the Calciferous group, or else the strata are inverted. This latter is not impro¬ 
bable, and the lower strata (a) correspond in some respects to the Trenton limestone, and others succeed in nearly their natural 
order. 
