The Cardross road takes you from Cardross to Renton , futher along this road from this cache site you will see Carman quarry and up on the hill there is Carman Hill Fort
Ancient hill-fort on Carman Hill.
This is one of several groups of boulders lying within the remains of an ancient hill-fort at this site. This south-facing location near the summit of the hill commands an excellent view over much of the valley of the River Leven, as well as to the River Clyde and beyond; for an impression of what can be seen from the for
This site has occasionally been described as being one of several Iron Age hill-forts in this area; however, opinion in recent years has favoured a later period of occupation in the Early Medieval Period (colloquially, the Dark Ages).
For most people who climb the hill, the groups of boulders are the "fort"; however, there is much more to see than that. The surviving remains are quite extensive, and, with some care, they are not too hard to pick out
The boulders are not the fort, though they are a noticeable feature within it. The fort itself, whose visible remains include an inner enclosure, an outer enclosure, sunken approach roads, and several hut circles, was first identified from aerial photographs as recently as 1954 (for further details, see the link given in the first paragraph). However, the prominent boulders here on the hill-top had not gone unnoticed before then: in the second half of the nineteenth century, the prevailing local folklore was that those large stones had been set here by the Druids.
Favouring the later period of occupation, the book "Archaeology Around Glasgow" (2007; Susan Hothersall) says: "The hillfort on Carman Muir is one of the largest in western Scotland. It was identified from aerial photographs as recently as 1954. Carman fort consists of a small enclosed area surrounded by a large outer enclosure. This type of 'citadel fort' is typical of the early medieval period, and Leslie and Elizabeth Alcock, who excavated at Dumbarton Rock, suggested that Carman may have been the immediate precursor of the royal seat at Dumbarton, commanding much the same territory
A people called the Damnonii were recorded as inhabiting this area at approximately the time of the Roman occupation of southern Scotland. The Strathclyde Britons (possibly descendants of the Damnonii) who later occupied this district had their kingdom centred on a rock which was given the British name "Al Clud", "the rock of the Clyde", later Gaelicized to "Dùn Breatann", the "fort of the Britons", which is now known as Dumbarton Rock.
The Carman hill-fort site is given statutory protection under the Ancient Monuments and Archaeological Areas Act 1979.