Geologic Trail Maps of the Grand Canyon

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The Geologic Trail Maps of the Grand Canyon combine the best of two worlds: geology and hiking! Part geologic guidebook, part topographic trail map, the rich geologic content provi des a succinct geologic summary of the trail without the need to bring a heavy guidebook. Use these maps on a hike in the Grand Canyon to know what rock units you will cross through, how key landmarks were formed, and gain a deeper understanding of Grand Canyon geology by pausing at each “Geology Stop” to observe a geologic feature of interest, such as stream piracy, ancient fossil tracks, or the Great Unconformity. The map also contains important trail information, including elevation profile, water sources, backcountry zoning, and historical facts about the trail and the Grand Canyon. On the reverse of the map is the rock unit legend and an abundance of graphics, photos, and information about the geology of the Grand Canyon, including stratigraphic column, hypotheses regarding the formation of the Grand Canyon, the geologic eras in the Grand Canyon, the origins of the Grand Canyon’s lava flows and volcanoes, and a map of major faults. The unfolded size is 18” x 24”, and the folded size is 6.25” x 4”. Geologic Trail Map of the Grand Canyon: Grandview and East Tonto Trails. This trail offers a glimpse into the Canyon’s mining history. Relic shafts that lie just off the trail delve into the depths of Horseshoe Mesa and the 325-million-year-old Surprise Canyon Formation. The trail to Horseshoe Mesa descends the face of the Grandview-Phantom monocline, formed during the region’s last major mountain-building episode. Witness the start of the Granite Gorge, where the 1.75-million-year-old Vishnu Schist is juxtaposed against the 1.25-million-year-old basal member of the Grand Canyon Supergroup. This trail starts at the Grandview Trailhead and ends at Hance Rapid, a one-way distance of 11.1 miles. Geologic Trail Map of the Grand Canyon: Tanner Trail. This hike features open, sweeping views very different from those of the Inner Gorge. Here, you see the river for much of the descent, and the tilted and faulted Proterozoic layers of the Grand Canyon Supergroup meet the Cambrian Tapeats Sandstone in a striking angular unconformity. A layer cake of Paleozoic rocks forms the spectacular 4,000-ft cliff of the Palisades of the Desert. The geologic drama is due to the Butte Fault, one of the most important in the Canyon, which has influenced the geography of the region for more than 1 billion years. Here it has formed the East Kaibab monocline and marks the eastern edge of the Grand Canyon and the end of Marble Canyon. This trail starts at Lipan Point (the Tanner Trailhead), and ends at Tanner Rapid, a one-way distance of 7.7 miles. Geologic Trail Map of the Grand Canyon: Hermit Trail. The Hermit Trail has been a famous world-class fossil locality since the trail was constructed in 1911. You barely have to step off the trail to see reptile, spider, and scorpion tracks exquisitely preserved in the lithified faces of sand dunes, as well as brachiopods, bryozoans, and crinoids which once lived in shallow seas which periodically inundated the region over millions of years. The Hermit Trail is so named after Louis Boucher, who built the Boucher Trail to the west, and lived on and off at nearby Dripping Springs. This trail starts at Hermit’s Rest (the Hermit Trailhead), and ends at Hermit Rapid, a one-way distance of 9.2 miles. Show more