SHEEP HILL FORT, Auchentorlie, above Milton.
ACCESS : Restricted. Within quarry property.
This is a scheduled monument.
This is an ancient iron age hillfort on the strategic dun or hill overlooking the Clyde and beyond. Not to be confused with the even more dramatic hill over Dumbuckhill Quarry.
Canmore tells us that when it was excavated it was shown to have been occupied over two periods : the earlier and smaller being the vitrified fort on the very summit of the knoll. One stretch of vitrified core is visible on the SW, but most of the rubble from the wall, reddened by heat, was removed to build the rampart of a larger enclosure which can be traced around the edges of the lower rock terraces. This later fort also has a triangular, lower enclosure on the S with a gateway visible in its E wall. A short traverse protects this gate. [Canmore].
The term vitrified fort is used. Exact explanations of how this occurred and why are elusive, but what is certain is that great temperatures were reached, whether intentionally or by accident and that the very rocks of the forts were fused together to some extent. This has evidently happened here. For an explanation, see the link below.
The fort is in close proximity to the active commercial quarry which now encircles it. This has led to concerns about its survival. It has been a major feature of Dumbarton ever since the area was developed as a town and, as seen by the fort on top, even back into ancient times. Quite how we value such natural features may differ with each of us, but as a backdrop to the town, we may be all the more distressed if it is altered by quarry operations. Its historical importance may be less obvious. PastMap records several ancient cup and ring marked rocks on the quarry periphery as well as the find of an ancient bracelet. (Some excellent ones were removed for safekeeping in the National Museum in Edinburgh).
This view as seen from the mudflats at low tide shows Dumbuck Hill on the left and Sheep Hill on the right.
In this view from across the Clyde Sheephill appears more prominent. The quarry can be seen. On the shore in front is Dunglass Castle.
AMUSING PLANET : https://www.amusingplanet.com/2019/08/the-vitrified-forts-of-scotland.html on vitrified hillforts.
WIKIPEDIA : https://en.wikipedia.org/wiki/Vitrified_fort#:~:text=Vitrified%20forts%20are%20stone%20enclosures%20whose%20walls%20have,generally%20situated%20on%20hills%20offering%20strong%20defensive%20positions. on vitrified hillforts.