Such were the Indian tribes who formerly dwelt within or near the country now embraced in the Yellowstone National Park. That the Sheepeaters actually occupied this country, and that wandering bands from other tribes occasionally visited it, there is abundant and conclusive proof. Indian trails,[F] though generally indistinct, were every-where found by the early explorers, mostly on lines since occupied by the tourist routes. One of these followed the Yellowstone Valley entirely across the Park from north to south. It divided at Yellowstone Lake, the principal branch following the east shore, crossing Two-Ocean-Pass, and intersecting a great trail which connected the Snake and Wind River Valleys. The other branch passed along the west shore of the lake and over the divide to the valleys of Snake River and Jackson Lake. This trail was intersected by an important one in the vicinity of Conant Creek leading from the Upper Snake Valley to that of Henry Fork. Other intersecting trails connected the Yellowstone River trail with the Madison and Firehole Basins on the west and with the Bighorn Valley on the east. [F] See historical chart, opposite. The most important Indian trail in the Park, however, was that known as the Great Bannock Trail. It extended from Henry Lake across the Gallatin Range to Mammoth Hot Springs, where it was joined by another coming up the valley of the Gardiner. Thence it led across the Black-tail Deer plateau to the ford above Tower Falls; and thence up the Lamar Valley, forking at Soda Butte, and reaching the Bighorn Valley by way of Clark's Fork and the Stinkingwater River. This trail was certainly a very ancient and much-traveled one. It had become a deep furrow in the grassy slopes, and it is still distinctly visible in places, though unused for a quarter of a century. Additional evidence in the same direction may be seen in the wide-spread distribution of implements peculiar to Indian use. Arrows and spear heads have been found in considerable numbers. Obsidian Cliff was an important quarry, and the open country near the outlet of Yellowstone Lake a favorite camping-ground. Certain implements, such as pipes, hammers, and stone vessels, indicating the former presence of a more civilized people, have been found to a limited extent; and some explorers have thought that a symmetrical mound in the valley of the Snake River, below the mouth of Hart River, is of artificial origin. Reference will later be made to the discovery of a rude granite structure near the top of the Grand Teton, which is unquestionably of very ancient date.