| 释义 |
Caradoc Geol.|kæˈrædək|
[f. Caer Caradoc, name of sandstone hills in Shropshire.]
Applied attrib. to a stage or series or to the rocks of the Ordovician System in Britain. Hence Caraˈdocian a.
1835R. I. Murchison in Phil. Mag. vii. 47 Caradoc sandstones. This name..has been derived from the..ridge of Caer Caradoc. 1855J. Phillips Man. Geol. 192 There is also a narrow tract of Caradoc sandstone running N.N.W. in the Lickey Hills. 1910Encycl. Brit. V. 300/1 In the Lake district the Coniston limestone series represents the Upper Caradocian. 1960L. D. Stamp Britain's Struct. (ed. 5) xii. 109 Caradocian and Ashgillian..being the lower and upper parts respectively of the old Bala Group. |