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Fort, Grinnan Hill is a univallate hillfort occupying a prominent position in Perthshire, built upon bedrock of the Arbuthnott-Garvock Group. The sandstone foundation, interspersed with conglomerate, siltstone and mudstone deposits formed during the Pragian period, would have provided a naturally defensible base for Iron Age settlement. The fort's location on high ground commands views across the surrounding landscape, a characteristic site selection for fortified settlements of this type in Scotland.
The monument is defined by a single rampart encircling the hilltop, a defensive feature typical of Scottish hillforts occupied during the first millennium BC. The exposed sandstone bedrock would have restricted the depth of fortification that could be achieved, likely influencing the design and construction method of the defensive works. The geology of the site, with its resistant sandstone core, would have provided a naturally strong foundation resistant to undermining and erosion.
Fort, Grinnan Hill is protected as a scheduled monument by Historic Environment Scotland under reference SM3088, reflecting its significance as a record of Iron Age fortification in Perthshire. The site preserves evidence of prehistoric settlement patterns and defensive architecture adapted to the local topography and geology of the eastern Highlands.
Fort, Grinnan Hill is a scheduled monument protected by Historic Environment Scotland under reference SM3088. View the official record →
Fort, Grinnan Hill is a univallate hillfort occupying a prominent position in Perthshire, built upon bedrock of the Arbuthnott-Garvock Group. It is designated a Scheduled Ancient Monument by Historic Environment Scotland under reference SM3088.
Fort, Grinnan Hill is a Scheduled Ancient Monument, legally protected by Historic Environment Scotland — the body responsible for designating and safeguarding heritage sites in Scotland. The official designation reference is SM3088.
Several scheduled monuments lie within 10 km, including Ardoch, Roman military complex 900m NNE of Ardoch Bridge (1.3 km), The Roundel,burial mound 400m S of Greenloaning Farm (2.5 km), Rhynd, enclosed settlement 600m ENE of (2.6 km).
This page is just one thread. A full Aubrey report pulls together 14 strands of Fort, Grinnan Hill's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Fort, Grinnan Hill stands on Arbuthnott-Garvock Group, bedrock that formed in the Pragian. The rock here is sandstone with subordinate conglomerate, siltstone and mudstone.