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it's still hard for me to grasp how this valley was formed but I'm slowly getting it. I think what is baffling is the length of time involved. However, some of the action on this mountain has been more recent. There is a tad of a hanging valley there too I see.
The Sentinel towers 3,000 feet and is a 7,120+ ft elevation Navajo Sandstone summit located near the Court of the Patriarchs. This feature's name was officially adopted in 1934. The Sentinel was once much bigger before a huge rock avalanche fell from it, when 4,800 years ago the Sentinel Slide with a volume of 286 million cubic meters (10.1 billion cubic feet) dammed the river, thereby creating Sentinel Lake which existed for 700 years and filled with sediments, creating Zion's flat valley.
The Sentinel towers 3,000 feet and is a 7,120+ ft elevation Navajo Sandstone summit located near the Court of the Patriarchs. This feature's name was officially adopted in 1934. The Sentinel was once much bigger before a huge rock avalanche fell from it, when 4,800 years ago the Sentinel Slide with a volume of 286 million cubic meters (10.1 billion cubic feet) dammed the river, thereby creating Sentinel Lake which existed for 700 years and filled with sediments, creating Zion's flat valley.