Here a complete set of observations, for latitude, longitude, &c., had been taken. Major Long and Lieutenant Swift having preceded the party in the morning, and arrived before seven o'clock for that purpose. In the evening, observations were attempted, but without success, as the sky soon became cloudy.
Robins, which we had not seen since we left the Missouri, here occurred in considerable numbers.
On the following morning, soon after leaving the encampment, we crossed Vermilion creek, a considerable tributary from the south. Its upper branches interlock with those of a tributary of the Arkansa. In some part of its course, its valley is bounded by {186} precipitous cliffs of a red sand-rock, whence the name of the creek.
Our guide informed us that the Indians, a few years since, destroyed every individual of a large herd of bisons, by driving them over the brink of one of these precipices.
Opposite the mouth of Vermilion creek is a much larger stream, from the north-west, which is called medicine-lodge creek,[136] from an old Indian medicine lodge, which formerly stood near its mouth. A few miles further, on the same side, is Grand Camp creek, heading also in the mountains. About four years previous to the time of our visit, there had been a large encampment of Indians and hunters on this creek. On that occasion, three nations of Indians, namely, the Kiawas, Arrapahoes, and Kaskaias or Bad-hearts, had been assembled together, with forty-five French hunters in the employ of Mr. Choteau and Mr. Demun of St. Louis.[137] They had assembled for the purpose of holding a trading council with a band of Shiennes. These last had been recently supplied with goods by the British traders on the Missouri, and had come to exchange them with the former for horses. The Kiawas, Arrapahoes, &c. who wander in the fertile plains of the Arkansa and Red river, have always great numbers of horses, which they rear with much less difficulty than the Shiennes, whose country is cold and barren.
View of the Chasm through which the Platte issues from the Rocky Mountains
The British traders annually supply the Minnetarees or Gros-ventres of the Missouri with goods; from these they pass to the Shiennes and Crow Indians, who, in their turn, barter them with remoter tribes: in this manner the Indians who wander near the mountains receive their supplies of goods, and they give a decided and well founded preference to those which reach them by this circuitous channel, to those which they receive from any other source.
Two miles beyond Grand Camp creek, is the mouth of Grape creek, and a little above, on the {187} opposite side, that of Defile creek,[138] a tributary to the Platte, from the south, which has its course in a narrow defile, lying along the base of the mountains.
At eleven o'clock we arrived at the boundary of that vast plain, across which we had held our weary march for a distance of near one thousand miles, and encamped at the base of the mountain. The woodless plain is terminated by a range of naked and almost perpendicular rocks, visible at a distance of several miles, and resembling a vast wall, parallel to the base of the mountain. These rocks are sandstone similar in composition and character to that on the Cannon-ball creek. They emerge at a great angle of inclination from beneath the alluvial of the plain, and rise abruptly to an elevation of one hundred and fifty or two hundred feet. Passing within this first range, we found a narrow valley separating it from a second ridge of sandstone, of nearly equal elevation, and apparently resting against the base of a high primitive hill beyond. At the foot of the first range, the party encamped at noon, and were soon scattered in various directions, being eager to commence the examination of that interesting region.