at Sussex and Franklin Zine Mines, N. J. 209 
layers or beds incline to the S.E., dipping under at an angle of 
about 80°. Subordinate to this sienite are found limestone, 
gneiss, and greenstone. . . . The limestone forms a bed without 
any apparent parallel seams or divisions, and is peculiarly char- 
acterized by its eminently crystallized structure, consisting of 
large straight lamellar masses, confusedly aggregated. . . . It is 
of a fine white color, presenting in some instances, a pearly lustre, 
slightly chatoyant. . . . The direction, inclination and dip of this 
imestone are the same as those of the aforementioned sienite. 
» “Next to the sienite, but evidently of a later formation, is 
This grau- 
y a blue limestone 
which rests upon it in parallel superposition ; this limestone is 
gray sometimes of a deeper gray passing into blue; its texture is é 
compact or subsaccharoidal; near the grauwacke it is slaty. 
sandstone being 15° or 20° more to the S.E . than the 
gneiss, The sandstone is as near as I can judge from its limited 
exposure not more than 30 feet thick; the slaty limestone, which 
Me upon the sandstone, is papi wonebae 8 gee cihieg 
eet thick, ¢ herty limeroc great thick 
Pi gta either in the pore 
orsandstone. Dr. Kitchell, Superintendent of the late Geol. Sur- 
hia wJ ized ths unconformability of the gneiss 
and the blue limestone and in his Annual Report for pate p. 
and onwards, refers to several localities where this can be seen. 
New Brunswick, N. J., July 2, 1861. 
Aa. Jour. Sct.—Szcoxp Serres, Vou. XXXII, No. %.—SEFT.. 1961. 
27 
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