A sign at this overlook notes that on a clear day it is possible to see as far as 152 miles. As you can see, today was not a clear day, but we were glad it was overcast. We did not want a repeat of Saturday when by late morning it was close to 100 degrees. Today the sun did not show up until at least noon. We had a pleasant hike to Upheaval Dome which is pictured below.
Here rock layers fractured and tilted forming a circular depression which is two miles wide. Scientists do not know whether this is the result of a meteorite impact or the remnant of a salt dome. An interpretive sign explained the latter phenomenon this way: when seas dried up they left thousands of feet of sand. Sediment covered that. Salt rose, fracturing and destroying rock layers in its path. Water eroded the salt and over-laying sediment, exposing the crater we see today. That is one explanation for this anomaly in the land of canyons. By the way, we have seen a lot of red sandstone, but there is white also- as seen above. The white sand came from ancient coastal sand dunes.
Just about in the middle of the picture above is the Green River. Around that area is the confluence of the Green and Colorado Rivers. The rivers and canyons here were explored by Major Powell, a one-armed Civil War veteran and geologist in 1969. He wrote the following: "this is a strange weird region" of naked rocks with "cathedral-shaped boulders towering hundreds or thousands of feet, cliffs that cannot be scaled, and canyon walls that shrink the river into insignificance". All information here that does not sound like my own brilliance came from information which the park provided! More on this park tomorrow.
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