CONGLOMERATES. 361 



The most peculiar rock associated with the Georgia slates, is a coarse conglomerate, 

 composed of large pebbles and bowlders of limestone, imbedded in a calcareous cement. 

 Often the cementing material is slaty, and the pebbles fuse, as it were, into the cement. 

 "We first find this variety in traveling north, near the north line of the town of Georgia, 

 near William Caldwell's house. It is next seen at Mrs. Montifer's house near the north 

 town line of St. Albans, a distance of four miles. It is not seen between these localities, 

 because the rocks are covered up by the Champlain clays. The pebbles composing these 

 strata contain a fossil, very much resembling the Phytopsis tubulosum of the Birdseye 

 limestone. 



About half a mile east of the village of Swanton, there is a boss of a peculiar bluish 

 limestone, standing entirely alone in a plain, which is probably connected with this con- 

 glomerate, for at the village the conglomerate is prodigiously developed. It is, at all 

 events, a variety of the Georgia slate formations. Following the road from Swanton to 

 Highgate Falls, this conglomerate may be seen almost every rod of the way, as it 

 forms a small ridge. Not only rounded pebbles, but large unrounded plates of a dark 

 colored slaty limestone are abundant among the constituents of the conglomerate. Upon 

 the supposition that the Georgia slate is presilurian, we cannot imagine from what rock 

 these fragments were derived. 



We left this range of conglomerate about three-fourths of a mile south of Highgate 

 Falls, and cannot say how far it continues to the north. Its strike carries it about half 

 a mile east of the Falls. The greatest superficial width covered by this conglomerate in 

 any one locality, we should estimate at twenty rods. 



DIVISIONAL PLANES IN THE GEORGIA SLATE. 



We have noted the following observations respecting the position of superinduced structural planes of 

 division in the Georgia slate : 



Locality. Strike. Dip of Cleavage Planes. Observer. 



Fairliaven, east of Myers & Utter's quarry, N. 40 W., E. H., jr. 



North of do., 40 E., E. H., jr. 



Fan-haven, Williams & Tillson's, About 80 E., E. H., jr. 



Fairliaven, Allen's south quarry, N. 70 E., E. H., jr. 



Fairhaven, Eagle Slate Co., N. and S., 60 E., E. H., jr. 



Fairhaven, Eagle Slate Co., N. 80 E., E. H., jr. 



West Castleton Eailroad and Slate Co.'s quarry, E. and W., 70 S., E. H., jr. 



Castleton, Barrett & Barnes, 30 E., A. D. H. 



D. Hooker's quarry, N. 20 E., 27 E., A. D. H. 



Castleton, Wm. Hughes', N. 20 E., 17 E., A. D. H. 



Eagle Slate Co., N. 10 E., 17 E., A. D. H. 



Castleton, Hydeville Co., 30 E., A. D. H. 



Allen & Cooper's quarry, N. 20 E., 20 E., A. D. H. 



Hughes' quarry,' N. 30 E., 32 E., A. D. H. 



Cornwall, north of center, N. 10 E., 90, C. H. H. 



Georgia, south part, N. 38 E., 90, C. H. H. 



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