Andyfellwalker,
I'm certain its galcial, having been there, and having seen many similar features in my mountaineering experience in the Lakes. There are burial cairns on the northern and of Troutbaeck Tongue, photos of which I have added to this site, and which Fitz has kindly responded to you with the links.
By the way, are you the Andyfellwalker of the website fame? I suspect so, as you were on Troutbeck Park yesterday. If so, we once corresponded by e-mail, about the unusual cloud conditions we experienced - you were on Grisedale Pike, and I was across the valley on the Whinlatter fells.
If it is you, your 17th Feb walk took you to Selside Pike, and you commented about the summit cairn, and the fact that there are no stones around, so they must have been transported there. It is listed as a Bronze Age burial cairn, and I added it to this site a while back. A similar Bronze Age burial cairn existes on High Raise to the north of High Street, and on its eastern ridge on Low Raise, also on this site. You will know of them.
Welcome to TMA - it's a great database for esoteric ancient sites in Cumbria and elsewhere, and makes a day on the hills more interesting - see the Langdale rock art, and the axe factory sites.
All the best,
TE.
