Balanced Rock was made possible today by my exceptional strength and balance. However if that is not a good enough explanation then please continue reading to reveal the true reason this rock maintains its stationary position today. Balanced Rock was exposed 60 million years ago when the Rocky Mountains were rising. The shape was defined by the soft bottom layer of shale that eroded much faster than the harder sandstone and conglomerate found atop the 700-ton bolder. Around balanced rock, as pictured below, you will see additional formations formed by the erosion of the softer shale layers.
Source: Park Informational Sign, found on site at Balanced Rock on October 16, 2010
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