that occur in the region’s sandstones are, as believed by some, excavated by the extremely rare and endangered Diamond-billed Rock Pecker. They remain elusive to this bird photographer and so a drawing will have to suffice.
Save the Pecker! This sticker is available at Moab Motorsports.
Geologists, on the other hand, would suggest that the eroded pockets are a product of chemical weathering by dissolution of the binding cements in the sandstone, with the wind sweeping out the grains, slowly through time. That seems to be the working explanation elsewhere.