The Cove is a valley commencing among the mountains at no great distance to the east of the hot springs, and containing a small rivulet which enters the Washita six or eight miles below Keisler's.[46] This valley is bounded towards the west by loamy hills, disclosing at intervals cliffs and ledges of clay-slate and petrosilex. In the lowest part of this valley, at a place called Roark's settlement, we discovered a bed of granite forming the basis of a broad hill, which rose by a very gradual ascent towards the east. We were directed to the examination which brought us acquainted with the existence of this rock by the representation of Roark, that in his corn field, not far from the house, was a bed of plaister of Paris. Being conducted to the spot, we found a quantity of loose granitic soil, that had been raised from a shallow excavation, and was intermixed with numerous large scales of talc. The examination had been carried a few feet below the surface, and had terminated upon the granite in question. Having collected {159} several beautiful masses of an aggregate of felspar, talc and quartz, we returned to the house where our breakfast was in preparation. Being informed by our landlord that blue vitriol, native copper, and other interesting minerals, had been formerly discovered near the sources of the little brook that ran past the house, we delayed our journey some time, that we might continue our examination. In following the brook towards its sources, we were much gratified in finding an extensive bed of native magnet, which seemed to be embraced in the granite. Not far distant the same rock contained large masses of pyrites and of bluish green mica. In these we readily perceived the blue vitriol and native copper mentioned by our host. In some places we found the bed of the brook paved almost exclusively with detached schorls. We collected also several other interesting imbedded minerals. More extensive examinations will hereafter show this spot to be one among the most interesting in America to a mineralogist. The great depth of soil resting upon this formation of granite prevented our examining it at as many points as we could wish; also from ascertaining to our satisfaction its extent, and its connexion with the neighbouring rocks. It appears, however, at several points in an area of fifteen or twenty acres, and always in place. We saw not a single detached mass at any distance. This may be owing in part to the perishable structure of the granite, and in part to its being surrounded on all sides by more elevated rocks of slate or sandstone. On the summit of the hill a grave had recently been dug. In the granitic soil which lay about it we saw many fragments of pyrites, also uncommonly large and beautiful laminæ of talc intermixed with scales of mica. These two minerals are, we think, rarely found in such intimate connexion, yet retaining so perfectly their distinctive characters, as in the instance under consideration.