dryfj.com / drycyclist.com (kevin cook)

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2701-arch.jpg The cool rocks formations in the Castle Peaks area are endless; this one harbors a small natural archThumbnailsOn the other side of this Castle Peaks arch is a rock formation that looks like a tortoise, with its head extendedThe cool rocks formations in the Castle Peaks area are endless; this one harbors a small natural archThumbnailsOn the other side of this Castle Peaks arch is a rock formation that looks like a tortoise, with its head extendedThe cool rocks formations in the Castle Peaks area are endless; this one harbors a small natural archThumbnailsOn the other side of this Castle Peaks arch is a rock formation that looks like a tortoise, with its head extendedThe cool rocks formations in the Castle Peaks area are endless; this one harbors a small natural archThumbnailsOn the other side of this Castle Peaks arch is a rock formation that looks like a tortoise, with its head extendedThe cool rocks formations in the Castle Peaks area are endless; this one harbors a small natural archThumbnailsOn the other side of this Castle Peaks arch is a rock formation that looks like a tortoise, with its head extended

How long did it take for this hole in the rock to erode?