At about the mouth of Millard Canyon, we leave Labyrinth Canyon and enter Stillwater Canyon, aptly named by members of the 1869 Powell voyage (Dellenbaugh, 1902, p. 276). The beginning of Stillwater Canyon is marked by vertical walls of the White Rim Sandstone. From here Powell’s men observed a butte to the southwest thought to resemble a fallen cross and named it “Butte of the Cross.” Farther downstream they realized they had been looking at two buttes, a small one in front of a larger one, so the feature was renamed “Buttes of the Cross.” An aerial view of Buttes of the Cross is shown in figure 64. [Illustration: BUTTES OF THE CROSS, looking southwest from the air. Millard Canyon enters Green River in foreground, North Point is in right middle ground, Orange Cliffs are in background, and Henry Mountains form right skyline. White Rim Sandstone forms White Rim near mouth of Millard Canyon and near Anderson Bottom at left middle. (See fig. 65.) Buttes are Wingate Sandstone capped by Kayenta Formation; slopes down to prominent ledge are Chinle Formation, Moss Back Member forming the ledge; steep and gentle slopes between ledge and White Rim are Moenkopi Formation. Photograph by National Park Service. (Fig. 64)] About 2 miles below the mouth of Millard Canyon, at Anderson Bottom, we reach one of the most interesting features on the river—the most recent rincon of a major river in the park, if not in the entire canyon country. Although some rincons are more recent, they are along minor tributaries such as Indian Creek (fig. 73). The cutoff at Anderson Bottom probably took place during the Pleistocene Epoch, whereas most of the others along the main rivers probably occurred during the Tertiary Period (fig. 80). An aerial view of the Anderson Bottom rincon is shown in figure 65, and a sketch of the drainage change is shown in figure 66. This feature was noted and correctly interpreted by Powell and his men, who applied the name Bonita Bend to the sharp new course the river took after the cutoff. Continuing through Stillwater Canyon, we pass Turks Head (figs. 23, 24) and head for the confluence of the Green River with the Colorado River. Figure 67 shows the canyon just west of the confluence. The lowest and largest cliff above the river is the upper member of the Hermosa Formation, overlain by the slopes and thin ledges of the Rico Formation. The massive sandstone at the top of the canyon wall is the Cedar Mesa. Junction Butte and Grand View Point are on the right skyline. We have already viewed the confluence and Cataract Canyon from the land and from the air (figs. 59-61); soon we will see them from the Colorado River. [Illustration: Petroglyph]