I've got a sneaking suspicion that I've seen a drawing of carvings on that side. It wasn't in the Stan book though, I haven't got it. It might be in there though. I think it may have been in a paper Dr M showed me. I reckon if you gave Aron an e-mither he'd know.

Just gonna go check the map to see if Elterwater is the place where Jac always says there's 'a thing over there'.