 The party continued south along the course of the Yellowstone River crossing the river twice until they reached the north shore of Yellowstone Lake near the mouth of Pelican Creek.From Pelican Creek, Cook-Folsom-Peterson followed the western shoreline of Yellowstone lake closely until they reached the West Thumb area.From West Thumb, the party stuck out due West over the Continental Divide and emerged on the northernmost point of Shoshone Lake.