There's a lot of those earthworks in that area, if you zoom the map out 1 level then this is in the bottom left corner - I think its part of the same system.
http://www.themodernantiquarian.com/image.php?image_id=5673
No idea what they're for or how old they are - not very old I would suspect as they would be easily ploughed out. I sure somebody will know though.
In the meantime the best way to find out is to go and find out for yourself - then let us all know. :)
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