Gravity happened along Utah 128...

between Moab and Castle Valley sometime today. This part of the Wingate escarpment along the Colorado River had been previously shedding rocks a few months before (on 18 August), but this large rockfall placed enormous sandstone blocks in the river. New obstacles for next year’s river runners.

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In speaking with some residents in Castle Valley, the consensus is that this occurred sometime mid-day today, and is not correlated with the small local tremor of the 20th.