
We were not really sure what to expect at Canyonlands. After two days in the relatively compact area of the visually stunning Arches NP, we were heading for a park so large that there are three different areas of the park. Add to that, adjacent to Canyonlands to the west and southwest is the Glen Canyon National Recreation Area.

We chose to visit the Island in the Sky portion of the park, mostly because it was the easiest access from Moab, we wanted to see Mesa Arch (title photo above) and in looking at the maps, the tortured paths of the Green River and Colorado River and the canyons that they cut as they flowed to their confluence just appealed to us from a scenic and geologic perspective.
On the ride over to the park, we happened on Monitor and Merrimac Buttes. Geologically, these are primarily composed of the generally lighter colored Navajo Sandstone (183 million years ago (mya)) and overlying Entrada Sandstone (166 mya) which are horizontally bedded remnants of a now mostly missing, Jurassic Period sandstone plateau. Erosion removed the adjacent portions of the plateau leaving the buttes because they had more resistant caprock on top that helped protect them from erosion.
If your civil war history is a little dim, Monitor Butte (named after the Northern ship) is the one on the right of the picture below and Merrimac Butte (actually named the CSS Virgina, the Souths ironclad) is on the left of the picture. They fought to a draw at Hampton Rodes Virgina in 1862.

The Island in the Sky district of Canyonlands National Park sits on a single high mesa with cliffs dropping into canyons over 1,000 feet deep. Its geology is a premier example of layered sedimentary rock, shaped by erosion, uplift, and ancient rivers as opposed to the landscape of Arches NP which was primarily shaped by salt tectonics. On either side of the district, there are the deep canyons carved by the Green (west side) and Colorado (east side) Rivers exposing relatively flat lying sedimentary rock formations. As you enter the park on Utah State Hwy. 313, you are greeted on the left (east) with Shafer Canyon.
The Shafer Trail today is a relatively low-key dirt road that drops over 1,500 feet down into the canyons below. It was originally a cattle trail built by the Shafer family, who ranched the mesa tops and canyon bottoms in the early 1900s. The Shafer Trail allowed cowboys to move livestock from the mesa (Island in the Sky) down to water and grazing in the canyons below. Portions of the original route were so narrow and steep that cattle were lowered by ropes in some spots (sort of an odd mental visual!). During the Cold War uranium boom of the later part of the 1950’s, the trail was widened and improved into a jeep road to access mining claims throughout the White Rim and Moenkopi formations. Uranium miners needed a way to haul ore out of remote areas, and the trail connected these areas to Moab and the Atomic Energy Commission processing facilities (the Moab mill of blog fame). The switchbacks in the road were blasted and graded during this period. After Canyonlands became a park, this road became a scenic backcountry road best navigated with a high clearance 4-wheel drive vehicle (probably most family sedans could navigate it in the cooler season, and there are no charging stations in the canyon) unless heights and significant vertical exposure bother you. We did not have time to run down and back and still see what we wanted to see. But this and the White Rim trail (a 100-mile shelf road that is a 2 to 3-day trip will be on the list for the fall).








From the District entrance and Shafer Trail area we made our way to Upheaval Dome stopping at various overlooks and scenic views along the way. This was a feature that for us was totally unanticipated and unknown until our stop at the park entrance and review of the map. A relatively short (.75 mile), 114-foot elevation gain trail led to what can only be characterized as a massive circular structure that sharply contrasts with the surrounding flat-lying sedimentary rock of the Colorado Plateau. The aerial photo below (North is at the top of the picture) looks down on the feature which is approximately 3-miles in diameter and 1,000 feet deep.

The older theory is that it is a Salt Dome (back to Salt Tectonics). In this theory, our old friend the Paradox Formation salt layers (deep underground) slowly rose, pushing overlying rock upward in a dome shape. Over time, erosion removed the overlying layers and collapsed the dome’s center. This theory is not crazy as it sounds, as there are locations in the Paradox Basin where other salt domes have been identified that have a very similar geometry as this. The newer theory is that it is an Impact Crater. It proposes that Upheaval Dome was formed by the impact of a meteorite, fracturing and uplifting rock in a circular pattern. This theory has gained traction because shocked quartz (a microscopic feature only created by high-pressure impacts, (see dinosaur extinction) has been identified at the site and radial faulting and breccia consistent with other terrestrial impact sites has been found. This theory supports an age that the impact was in the mid to late Jurassic Period around 170 million years ago. The gallery below includes some ground level photos of Upheaval Dome. I like the meteorite theory because it was done and done. No long-term slow moving geologic processes. Just a catastrophic kaboom. Not here this morning; here this afternoon!









We headed back with the three major stops planned, Green River Overlook, Grand View Point Overlook (lunch) and Mesa Arch with a non-specified location for an ice-cold beer. Again, many stops enroute.
Green River Overlook was just an expansive view of the White Rim and the canyons associated with the Green River. The Gallery below is a selection of photos from the overlook mostly in a southerly direction.









Grand View Point is pretty much self-explanatory. A hundred-mile view to the south and southeast with a little southwest. This then is the Colorado River side of the mesa. There is a photo in the gallery below with a good definition of what you are looking at. The flat area is the White Rim formation which is a resistant rock layer. In many of the pictures, you can see the White Rim Road, a potential fall trip. The Gallery below is a collection of photos from Grand View Point.










Heading back to the barn as Grand View Point is the southern terminus of the Island in the Sky Road. Moving back north to the Mesa Arch – the Canyonlands Arch that pictures of Canyonlands NP all include. Mesa Arch formed in the Navajo Sandstone. It is a short walk of 0.7-miles out and back with only about a 63-foot elevation gain to go hang out with your fellow man. Again though, I was amazed at my fellow man’s appreciation for what they were seeing. National Parks in the off-season are nice.

Mesa Arch is relatively small compared to the arches in Arches NP. It spans about 27 feet and is only 6 feet high at the center. However, Mesa Arch sits on the edge of a cliff. One false step after standing under the arch and those measurements pale in comparison to the drop off directly behind the arch. If you step a little beyond the backside of the arch or slip and topple over the edge, you will have 8.7 seconds while you fall 1,200 feet to the first stop down. The Gallery below includes Mesa Arch photos.














After a fabulous day of Canyonlands NP, we stopped at a viewpoint and enjoyed a frosty brew then on to Moab for a low key but very tasty dinner at Zax. An early night as there was a lot more walking/hiking than I told stories about here and both of us were feeling a little tired.
On to Montrose and the Grand Canyon.