The upstanding remains of what is believed to be a pre-improvement agricultural settlement was identified during a watching brief undertaken by staff from CFA Archaeology Ltd on groundworks for an access road for a proposed substation at Inverarnan, by Ardlui, in Loch Lomond and the Trossachs National Park. It is believed that these remains relate to a settlement depicted on Roy's c. 1750 military map, which is 'Garball'. A more recent farmstead situated immediately to the east of the proposed development area also has this name, but the spelling has been changed to 'Garabal'.
The principle features associated with the settlement consisted of a probable creel house with an attached kale yard containing rig and furrow. A further area of rig and furrow was identified immediately to the south of the creel house on the opposite side of a small watercourse, along with a stone-built enclosure and a further enclosure that was only visible on aerial photographs. Immediately to the north of the creel house, there are a number of possible structures / enclosures, but these are very poorly preserved and there is a degree of uncertainty that they are actually archaeological in nature. The general area also contained a number of turf and stone field banks, one of which formed a revetment around the base of a knoll. All the features were identified immediately in advance of the groundworks and there were no additional features identified during actual topsoil stripping. The line of the road was altered so that the settlement could be preserved in situ.