| 释义 |
Cromer|ˈkrəʊmə(r)|
[The name of a town on the Norfolk coast.]
Cromer Forest Bed: the name of a series of deposits which outcrops on the coast at Cromer, comprising two freshwater beds which enclose the Forest Bed proper, an estuarine bed of clay containing the transported remains of trees and rich in plant and animal fossils.
From its position (see quot. 1964) the series was formerly thought to be pre-glacial, of Pliocene age, but it is now generally thought to have been deposited during the first (antepenultimate) interglacial, in the early Pleistocene, and its flora and fauna are taken as typical of this interglacial in Britain.
[1840C. Lyell in Phil. Mag. 3rd Ser. XVI. 377 A general subsidence..must have taken place..in order to explain the submergence and burial of the trees of which the stools are found in situ; and this forest bed could not have been brought up again..to the level of low water, without a subsequent upheaval.] 1863― Antiquity of Man 511/1 Cromer forest bed. 1882C. Reid Geol. Country around Cromer iii. 8 The so-called ‘Cromer Forest-bed’, celebrated for the number and variety of the fossil mammals which it has yielded. 1902Encycl. Brit. XXXI. 439/2 The latest Pliocene, or pre-Glacial, flora of northern Europe is best known from the Cromer Forest-bed of Norfolk and Suffolk, a fluvio-marine deposit which lies beneath the whole of the Glacial deposits of these counties. 1946L. D. Stamp Britain's Struct. xiv. 156 The Cromer Forest Bed series which we mentioned as the youngest Pliocene beds in Britain are claimed by some as early Pleistocene. 1964K. P. Oakley Frameworks for dating Fossil Man i. 102 The Cromer Forest Bed was for long regarded by British geologists as ‘pre-glacial’, for it is overlain by the oldest known glacial deposits in East Anglia... In 1950 Woldstedt published Thomson's pollen-diagram of the Cromer Forest Bed which showed that it was undoubtedly interglacial in character. |