At the edge of a gravel pit, might have been bulldozed into a line to form a barrier. Or perhaps it's the spoils dumped there after they extracted whatever they were digging for?
Would take a lot of time and erosion to wear that feature down to anything near the size of the one in the OP.
Would take a lot of time and erosion to wear that feature down to anything near the size of the one in the OP.
