Friday, July 28th. From an elevated point, about eight miles south of our encampment of last evening, the high peak at the head of the Arkansa was still visible when we passed this morning. From a computation of our courses and distances we find we cannot, according to our estimate, be less than one hundred and thirty miles distant from its base; but the air at this time happened to be remarkably clear, and our elevation above the common level of the plain considerable. By referring to Pike's "Journal of a Voyage to the Sources of the Arkansa," it will be seen that this peak is the most prominent and conspicuous feature in a great extent of the surrounding country. "It is indeed so remarkable as to be known to all the savage nations for hundreds of miles around, and to be spoken of with admiration by the Spaniards of New Mexico, and was the bounds of their travels north-west. Indeed, in our wanderings in the mountains, it was never out of sight, except when in a valley, from the 14th of November to the 27th of January."[48] {267} Notwithstanding this representation, and the fact that the peak in question was seen by ourselves at the distance of one hundred and thirty miles, we are inclined to the opinion, that in point of elevation, it falls far below many portions of the interior ridges of the mountains which are visible from its summit, and from the plains of the Platte, and that it is by standing a little detached from the principal group of the mountains, it acquires a great portion of the imposing grandeur of its appearance. In the forenoon of this day we passed some tracts of grey sandstone; having, however, met with several inconsiderable conic hills belonging to that interesting formation, called by the disciples of Werner,[49] the fletz trap rocks. We perceived before us a striking change in aspect and conformation of the surface. Instead of the wearisome uniformity, the low and pointless ridges which mark the long tract of horizontal sandstone we had passed, we had now the prospect of a country varied by numerous continued ranges of lofty hills, interspersed with insulated cone-like piles, and irregular masses of every variety of magnitude and position. This scenery is not to be compared in point of grandeur with the naked and towering majesty of the great chain of the Andes, which we had lately left, but in its kind it is of uncommon beauty. The hills, though often abrupt and high, are sometimes smooth and grassy to their summits, having a surface, unbroken by a single rock or tree, large enough to be seen at the distance of a mile.