Similar legends of submerged towns are prevalent in the south of Scotland, on the littoral facing the Irish coast. In the neighbourhood of Carlingwark Loch, Kircudbrightshire, in which are sites of crannogs, there has been from time immemorial a tradition that “there had been a town in the loch which sunk or was drowned;”[40] whilst a Scotch writer states that, “amongst other points of coincidence between Scotch and Irish crannogs may be noticed a tradition connected with some of them, common to both countries, which seems to have arisen from the submersion of the island homes by the rising of the waters in the loughs.”[41] The same idea is held by the natives of Central India: “from this hill is heard the sound of fairy drums; in that lake are seen reflected the ruins of a buried city.”[42]
The tradition of towns buried beneath the waters is not confined merely to the lakes of Ireland: there is the beautiful fable of the City of Gold, hid beneath the angry ocean, sometimes seen, but ever in different localities:
“Yet at times the waves sever,
And then you may view
The yellow walls ever
’Neath the ocean’s deep blue.”
Submarine Crannogs.—After a very high tide at Ardmore, near Youghal, the waters retired more than customary, disclosing the fact that this particular portion of the sea-shore had been the site of a forest, as remains of trees were found in various parts of the submarine deposit. This submerged tract extends to between the four and five fathom line, but it has not been ascertained to what further distance it may stretch seaward. A bank of shingle having shifted by a change of current, laid bare the substructure of an undoubted crannog: at high water it was covered by the tide to a considerable depth. Either this dwelling had been erected when Ireland was joined to Great Britain, or it was existent when Ireland was at a greater elevation above the sea, and therefore of greater extent than at present. The theory is enunciated by eminent geologists that many of our present harbours had been inland lakes in prehistoric times, and thus the Bay of Ardmore may have formerly presented a similar appearance to the Gulf or Lake of Maricaibo in Venezuela at the present day.
In the Irish Records, lake dwellings are likewise designated “Stockaded Islands,” and in the Ulster Inquisitions of 1605, the term applied to them is insula fortificata. Although antiquarians have differed in opinion respecting the age of these remains, yet after patient analysis of the characteristic features of the numerous excavations made in recent years, the weight of evidence seems to indicate that these constructions were of all ages, some being very ancient; it is quite apparent that they have been built and rebuilt, and in them have been found implements of stone, bronze, and iron in their respective strata. It would seem, indeed, that the “age of bronze” had in many instances largely overlapped that of iron. The chronology of this period is a subject that has not as yet been determined, and the time when it commenced and when it ended is still unsettled.
Favourite Sites for Crannogs.—Marshes, small loughs surrounded by woods, and large sheets of water, were alike suitable for the home of the Irish lake-dweller, his great and primary need being protection; he was bound by no conventional engineering rule, he did not exclusively employ wood, but appears to have been guided by surrounding circumstances. On peaty or muddy sites a wooden substructure was essential; on hard bottoms, stone, gravel, or earth were, if convenient, employed. As providing good fishing grounds, the entrance or exit of stream from lake was a favourite site, and natural shoals thus placed were eagerly selected.
Mode of Construction of.—Having decided on the position, the crannog builder set to work by driving stakes into the bottom of the lake in a circle of from sixty to eighty feet in diameter, a considerable length of the stake sometimes projecting above the water; these were in many instances joined together by horizontal beams, the interior filled up by branches of trees, stones, gravel, earth, and bracken. Often an inner row (or more than one) of piling is found about five feet distant from the outer, and piles are driven in various parts of the interior, either to consolidate the mass or to act as stays for the walls of the dwelling. Next were placed one or two layers of round logs, cut into lengths of about six feet, generally mortised into the upright piles, kept in position by layers of stone, clay, and gravel. In some cases, where the foundation was soft, the superincumbent layers of timber were of great depth; in other cases, where the bottom of the lake was firm, the platform of timber was confined to a portion of the island. The side most affected by the action of the water was frequently strengthened by rows of piles, sometimes five or six deep, as well as by a breakwater of stones.[43] On the foundation, when raised sufficiently above the water, the dwelling was erected; the hearth was in the centre of the island, for in almost every case a collection of flag-stones has been discovered in the interior of the enclosure, bearing on them marks of fire. At times several hearths occur. In some instances there are indications of these structures having had additions made to their height at various times, either to keep pace with the chronic rising of the level of the lough; or, taking into consideration the compressible nature of the component parts of the foundation, the island may have required increased elevation, owing to the effect of natural subsidence. The enormous amount of wood employed in the formation of a crannog, despite the mass of stones and other material with which it was laden, must have had at first a buoyant tendency, but according as the wood became completely saturated with water, consolidation of a more or less pronounced character would, in the course of time, become observable. The stones deposited over the lower strata of fern, bracken, and branches, were indubitably used to compress and solidify the substructure, as likewise were the stones on the upper strata used for a similar purpose. Considerable ingenuity was displayed in the formation of these island homes, which were frequently constructed in a depth of twelve to fourteen feet of water; and, apart from having served in their day as secure retreats for large numbers of persons, they have proved their durability by resisting successfully the ravages of time, which may be reckoned by centuries.