The Upheaval Dome is one of the most interesting features in Canyonlands and may be the remains of a 500 to 1000 foot meteor strike that occurred 60-160 million years ago. The alternate theory is a salt bubble rose and deformed the area. There are interpretive signs discussing the alternate theories on the Upheaval Dome Overlook Trail.
The Syncline Loop crosses the Upheaval Dome Trail a few feet from the trailhead. I turned left but hikers can go either way. Turning left and following around clockwise puts the wide views more in front of you. The descent going clockwise has many switchbacks and is much like walking down stairs. It looks like some of the rocks have been arranged to make the footing easier. Large sandstone outcrops highlight the scenery.
Near the trail beginning there is a sign warning that the trail is strenuous and may be difficult to follow. The 1300 feet of elevation change makes the hike fairly strenuous but it is also well marked with rock cairns and isn’t hard to follow. The upper segment of trail is Pinon Pine and Utah Juniper Forest with the common desert shrubs including Mormon Tea, Prickly Pear and Barberry.
It is 3.4 miles to a signed junction with the Upheaval Canyon Trail that makes a left turn and leads down canyon 3.5 miles toward the White Rim Road and the Green River.
Staying on the Syncline Loop Trail it is another 0.3 miles to the 1.5 mile Crater Spur Trail that makes a right turn and explores the interior of the Upheaval Dome.
The Loop Trail doesn’t have any rim views into the Upheaval Dome crater, so this side trail is the only place to view the interior. This low area of the trail follows a dry wash and vegetation is very sparse.
I met some returning backpackers who had traveled further down canyon and had visited a ruins site near the river. The clockwise route is a shorter distance to the bottom trail junctions and looked to be an easier climb for those carrying a heavy pack.
The Loop Trail doesn’t have any rim views into the Upheaval Dome crater, so this side trail is the only place to view the interior. This low area of the trail follows a dry wash and vegetation is very sparse.
I met some returning backpackers who had traveled further down canyon and had visited a ruins site near the river. The clockwise route is a shorter distance to the bottom trail junctions and looked to be an easier climb for those carrying a heavy pack.
The trail segment that starts to climb back up the Syncline Valley has some pools of water in the creek and has quite a bit of rock scrambling. The scrambling section is about the midway point of the loop hike. 
There is one spot where steps have been carved. There were the remains of some metal bars next to the steps. This might have been a formerly difficult spot that has been made easier. I thought this section seemed a little more slippery with loose material than other parts of the trail.
After the scrambling section, the trail continues to climb but only gradually. In mid March, an always shady segment along the Syncline Creek still had a large snow patch on an otherwise mild day. The 4.6 mile north section of the loop stays in the canyon and doesn’t have any wide views. My hike took 5:15 hours for the 8.3 miles. I carried 2 liters of water on a 55 F degree mid March day, but I think 3 liters would have been a better choice. I met two groups of hikers taking the counter clockwise route, a group of 2 and a group of 8.
There are two theories attempting to explain Upheaval Dome. The more traditional explanation is that the salt layer below the accumulated sediment pushed upwards. The more recent proposal is that a meteor strike 60 million years ago caused the ¾ mile deep crater. 
