Could be frost forcing up soil. A similar effect is seen in regions that have permafrost, it results in stone circles IIRC, and can bring skeletons up to the surface.
Did you get any photos?
Looking at satellite images, they could be one of two things, both man made.
They could be burial mounds, being on high ground, a very likely possibility, or, something to do with the reservoir.
A quick search on [b]Google[/b], did list some burial mounds in that area.
I'm no expert, but looking at Google maps, there are some interesting formations around there.
But no mention of forts or tumuli on the online OS maps.
Its not easy to tell from such small sized images, but my initial thoughts are water erosion of softer ground for the first two.
Which would back up Mike fae Dundee's theory.
If you click [b]HERE[/b], this image, was taken on Waun Fach, classic case of peat erosion.
No worries, we've all got to start somewhere.
There are many different programs for re-sizing, some free, some come with Windows or Microsoft Office and others, of which there are many, you can purchase.
Because its no extra cost, I use Microsoft Office Picture Manager, which comes with Microsoft Office.
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