A general description of the features which distinguish this style of architecture has been given in the Introduction,[147] together with a short summary of the Scottish structures in the Norman style.[148] The more minute features will be referred to in the descriptions of the various churches. It may, however, be pointed out that few structures survive in Scotland which exhibit elevations of façades, such as the east and west fronts of churches, or the north and south façades of transepts, which show the true Norman character. In all Norman churches of any importance in other countries the façades forming the end elevations in the above positions are composed of several stories, piled up one above the other. (See Fig. 17.) In the later styles, the design of the façade is generally composed of one predominating feature, such as a large traceried window, or a series of lofty lancets (like the Five Sisters of York), rising above a single lower story, which generally contains a doorway. But in Norman architecture the façades are usually divided up into a series of stories, one over the other--an arrangement which, to a certain extent, fails to give the impression of one large structure, such as is conveyed in the façades of the later Gothic styles. In Scotland proper there is only one building of magnitude in which this storied style is preserved--viz., the Abbey Church of Kelso. The same features may, however, be still observed in the façades of the transepts of Kirkwall Cathedral, Orkney. At St. Andrews Cathedral the original storied Norman east end was subsequently altered. In other large Norman churches, such as Dunfermline Abbey, the façades have been removed or altered. The smaller churches in the Norman style are not of sufficient height to give expression to this peculiarity. It has been shown in the preceding chapter that some of our early Celtic structures were transitional, and contained some signs of the approach of the Norman style; but after its introduction, in the twelfth century, that style at once became universal in the civilised parts of the country, and all the churches of that date of which any portions survive were erected in accordance with the Norman fashion. It has been often remarked that the twelfth century was the great church-building epoch in Scotland, as elsewhere, and the number of these Norman edifices still traceable in the south and east of the country is very large. The parish churches are generally small and aisleless, most of them being single oblong chambers, with an eastern chancel, sometimes with an eastern apse, and occasionally there was a western tower. St. Nicholas’, Aberdeen, was cruciform, and had a central tower.