I've looked at a number of stone burial sites in Ireland. That looks less like a small circle to me than an old tomb. I notice rough shaped ground to one side with a hollow in the middle. This could be what you describe as a burial mound to the east. That direction fits with ancient practice in Ireland. Flattish stones being upended and set in a coffin shape facing east. Look up Carrowmore, County Sligo for lots of examples to compare. Its a major site predating the more famous Newgrange across the country. Most tombs are individual and scattered around the country and many look like Doll Tor. I'm from Lancashire and moved here a few decades ago. Seeing how the ancient folk had a similar culture across north and west Europe blows me away.
