In the much more slow-moving styles of vernacular architecture, "Tudor" has become a designation for half-timbered buildings, although the truth is there are cruck and frame houses with half timbering that predate 1485 by quite a bit and the style bleeds early into the Jacobean era and a closer examination is required to determine the edifice's age, while in many regions stone architecture presents no exposed timber on the facade. In this form the Tudor style long retained its hold on English taste. Nevertheless, "Tudor style" is an awkward style-designation, with its implied suggestions of continuity through the period of the Tudor dynasty and the misleading impression that there was a style break at the accession of James I in 1603, first of the House of Stuart. A better diagnostic is the "perpendicular" arrangement of rectangular vertically-oriented leaded windows framed by structural transoms and mullions and often featuring a "hooded" surround usually in stone or timber such as oak.