Strathglass has been carved out by water and
glacial action along the line of the
Strathglass Fault through Loch Eil Group
psammites of the
Loch Ness Supergroup. The northeast–southwest aligned
fault is a
Caledonoid tectonic feature. The floor of the valley is formed from
alluvium deposited by the river, backed by remnant
river terraces in places. The Christianisation of the
Picts and
Gaels of Strathglass is believed to have been spearheaded by Irish missionaries of the
Celtic Church from
Iona Abbey, during the abbacy of St
Columba's kinsman and immediate successor, St
Baithéne mac Brénaind, who is referred to in Strathglass as St Bean. Beginning on 27 May 1700, underground Catholic bishop
Thomas Nicolson had visited Strathglass. In his later report, Nicolson had described the region, unlike the
Hebrides, as so abundant with trees that the local population lived in
wattle and daub houses instead of dry stone and
thatch crofts. He explained, "They are called Criel Houses, because the larger timbers are interlaced with wickerwork in the same way baskets are made. They are covered outside with sods, or divots. All of the houses on the mainland, wherever we went, are built in this fashion, except those of the lairds and principal gentry. Strathglass is partly inhabited by
Frasers, whose chief is Lord Lovat, and partly by
Chisholms under the Laird of Strathglass. These latter are all
Catholics." The once heavily populated Strathglass began to empty of its people, first through
voluntary emigration and the
estate clearances ordered by Mrs. William Chisholm of Chisholm in 1801, "In 1801, no less than 799 took ship at
Fort William and
Isle Martin from Strathglass,
The Aird,
Glen Urquhart, and the neighbouring districts, all for
Pictou, Nova Scotia; while in the following year 473 from the same district left Fort William for
Upper Canada, and 128 for Pictou. Five hundred and fifty went aboard another ship at
Knoydart, many of whom were from Strathglass. In 1803, four different batches of 120 souls each, by four different ships, left Strathglass, also for Pictou; while not a few went away with emigrants from other parts of the Highlands." Odo Blundell commented in 1909 that the language, customs, and
oral tradition of Strathglass were better preserved in
Nova Scotia than at home. ==Local residents==