| 释义 |
Wenlock|ˈwɛnlɒk|
The name of a town in Shropshire, used attributively in Wenlock formation, group, a formation of Upper Silurian age, typically developed near Wenlock. Also Wenlock limestone, shale, slate. In mod. use, the name of the middle of three divisions of the Silurian, lying below the Ludlovian and above the Valentian (Llandoverian); used attrib. and absol.
1834Murchison in Proc. Geol. Soc. II. 14 The lower part of this formation is termed the ‘Wenlock shale’. Ibid., The shale beneath the Wenlock limestone. Ibid. 15 The Ludlow and Wenlock formations appear in the same escarpment. 1843W. Humble Dict. Geol. etc., Wenlock slate. Called also Wenlock shale. 1890Hardwicke's Sci.-Gossip XXVI. 247 Splendid examples of Wenlock fossils. 1946[see Ludlovian a.]. 1969Bennison & Wright Geol. Hist. Brit. Isles vi. 116 A great deal of relatively recent work has been done on the limestone and shale shelf-sea facies of Wenlock and Ludlow age in the Welsh Borders. 1979R. Anderton et al. Dynamic Stratigr. Brit. Isles vii. 96/1 Turbidity currents deposited sands in a separate turbidite zone during the Wenlock and lower Ludlow.
Hence wenˈlockian a., of or belonging to the Wenlock formation or series. Freq. absol.
1855J. Phillips Man. Geol. 104 The genera being mostly Wenlockian and Ludlovian. 1946[see Ludlovian a.]. 1969Bennison & Wright Geol. Hist. Brit. Isles vi. 124 The thickness of the Wenlockian strata may amount to about 25,000 feet. 1974Encycl. Brit. Macropædia XVI. 774/2 The Llandoverian..saw the beginning of a sharp distinction between basin graptolitic shale facies and calcareous and..sandy shelf facies. This distinction was well marked in the Wenlockian. |