WalesThe site is composed of Ordovician volcaniclastic rocks forming part of the Builth Inlier, also notable for trilobite fossils [1].
Gilwern Hill, Powys
Also known as: Bryn Gilwern, Gilwern Hill
| Type | Megalithic stones |
|---|---|
| Period | 4500 - 3000 BC |
| Country | Wales |
| Coordinates | 52.2001° N, 3.3333° W |