| 释义 |
Longmyndian, a. Geol.|lɒŋˈmɪndɪən|
[f. Long Mynd (see def.) + -ian.]
Applied to a thick series of non-fossiliferous sedimentary rocks in the west Midlands, now believed to be of Pre-Cambrian age, whose main outcrop forms the hills of the Long Mynd in southern Shropshire (Salop). Also absol.
1888C. Callaway in Trans. Shrops. Archæol. & Nat. Hist. Soc. XI. 239 We are able to determine the relative ages of the three most ancient rock-systems in the region, viz., the Malvernian, the Uriconian, and the Longmyndian... The great series which forms the Longmynd Hills was referred..to the Lower Cambrian; but until good evidence of its age is obtained, I have thought it better to use a local designation. Ibid. 240 The Longmyndian conglomerates are largely derived from the Uriconian. 1929Evans & Stubblefield Handbk. Geol. Gt. Brit. iii. 20 The outcrop of the Longmyndian Rocks at Church Stretton forms the wild, moorland tract called the Longmynd. 1967D. H. Rayner Stratigr. Brit. Isles ii. 45 The structures in the Longmyndian pediments..suggest strongly that the western part of the Wentnor outcrops are inverted. 1969Bennison & Wright Geol. Hist. Brit. Isles iii. 67 The Longmyndian is in the form of a very large syncline. |