They have been called "Megalithic walls" by some in Yorkshire, I know one site which is a really good example, showing how they were the result of the original field clearance with some of the original walls still standing to 6 feet, unlike most you get in Yorkshire which is usually just the bottom course serving as foundations for a more modern dry stone wall.
Some of these were incorporated into strip lynchets and appear to serve to hold up the bank.
I would say a lot of these date to the late Neo/Bronze Age, but its very difficult to prove.
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