The "reef" itself is not a traditional reef in the same sense as a coral reef formed offshore. This is a monoclinal fold (for you geology fans!) that stretches for over 100 miles. It was called a reef by the pioneers because it looked just like a barrier that they would not be able to get around. In fact, the Waterpocket Fold that makes up this part of southern Utah was one of the last places mapped in the U.S.!
Here is a view of the rock units exposed at Capital Reef. At the top, the "white" or "buff" color knobs are the Navajo Sandstone. Below them, a cliff forming unit called the Wingate Sandstone. (Both of these sands were deposited by wind in ancient deserts). Lower on the hill are the Chinle Formation (known for petrified wood and uranium) and the bright red at the bottom of the stack is the Moenkopi -- old river deposits.
PDP is in the foreground studying the rock units for a test later. Ha!
We also hiked out to Hickman Bridge, a natural arch in the Navajo Sandstone. It was hot, hot, hot that day -- sometimes over 100 degrees F. This makes hiking difficult and sweaty. The evaporation rate is so high though, you don't stay wet or sticky for long.
That's all for now!