USGS Earth Science Photographic Archive digital files: hjk00722 and hjk0722a
Rocks exposed at the surface along the Green River grow progressively older downstream toward the Confluence of the Green River with the Colorado River (also called the Grand River in during Powell's Expedition). Trin Alcove Bend is located about 28 miles south of "Gunnison Crossing" (at Green River State Park in Green River, Utah). Trin Alcove is located about 2 miles downstream of the entrance to the section of canyon that Powell named "Labyrinth Canyon." The Second Expedition camped here on September 8, 1871 and spent time exploring the canyons in the vicinity. Cliffs in this section of the river consist of Navajo Sandstone (latest Triassic to Early Jurassic in age).
