| 释义 |
Dalradian, a. Geol.|dælˈrɑːdɪən|
[f. Dalrad-, altered form of Dalriada, name of an ancient kingdom in Scotland and northern Ireland + -ian.]
Epithet of a series of metamorphosed sedimentary and volcanic rocks found in a belt running north-east from the west coast of Ireland through the southern highlands of Scotland, thought to be of early Cambrian age and in part probably pre-Cambrian; of or characteristic of this series. Also ellipt.
1891A. Geikie in Q. Jrnl. Geol. Soc. XLVII. 75 It is well known that from the old kingdom of Dalriada, in the north of Ireland, a colony settled in Argyllshire, and gradually acquiring dominion over the whole of Scotland, gave that kingdom its present name. I would therefore propose that the term ‘Dalradian’ might be adopted..for the crystalline schists of the north of Ireland and centre and south-west of Scotland. (The adjective ought properly to be ‘Dalriadan’, with the accent on the second syllable; but I feel compelled to alter it into a form more consonant with English habits of pronunciation.) 1903― Text-bk. Geol. (ed. 4) I. ii. ii. 192 The limestones of the Dalradian metamorphic series of Scotland (Islay), which may possibly be pre-Palæozoic. 1910Encycl. Brit. XIV. 744/2 The other metamorphic areas of the north [of Ireland] present even greater difficulties... Hence it is useful to speak of them merely as ‘Dalradian’. 1931Gregory & Barrett Gen. Stratigr. i. 33 The Lennoxian, along the southern side of the Dalradian, is a band of slates, grits, and fine conglomerates composed of fragments of the Dalradian Schists. 1959Chambers's Encycl. XI. 164/2 The Dalradian Series, which is of considerable thickness, contains a great variety of metamorphosed sediments including quartzites, grits, limestone, slates, phyllites, mica-schists and gneisses. 1962Times 6 Feb. 3/7 His work on structures and metamorphism in the Dalradian of the Scottish Highlands. 1967D. H. Rayner Stratigr. Brit. Isles iii. 66 This genus is only known from beds of Lower Cambrian age..and the uppermost Dalradian strata are therefore Cambrian, but how much is uncertain. |