Late Pleistocene deposits at Wretton, Norfolk. I. Ipswichian interglacial deposits
- 12 March 1970
- journal article
- Published by The Royal Society in Philosophical Transactions of the Royal Society of London. B, Biological Sciences
- Vol. 258 (818), 1-30
- https://doi.org/10.1098/rstb.1970.0030
Abstract
Interglacial deposits found in the low terrace at Wretton, Norfolk, were formed in the zones II and III of the Ipswichian interglacial. The variety of sediments found is associated with the fluviatile environments of a meandering river. During zone II there was a regional mixed oak forest, with the local development of alder carr, fen, reedswamp and open water communities. During zone III the regional vegetation was more open andCarpinusbecame an important woodland tree. Locally, fen, reedswamp and open-water communities persisted, but alder carr was absent. The plants give some indication that the climate may have been more continental than at present, a number of species occurring which are not native to the British post-glacial flora but which have a wide distribution on the Continent. A brief comparison of the vegetational history is made with that of other Ipswichian interglacial sites in England and with the correlative Eemian interglacial on the Continent. The interglacial sections at Wretton form one of the richest Ipswichian sites for non-marine Mollusca so far found in England. The presence of a few more southern or more continental species, not now living in England, confirms that the climate was probably slightly warmer than at present, at least in summer. Numbers are large enough for satisfactory analysis in almost all sections, so that the environmental conclusion they suggest can be checked against those deduced from the plants. In general, these conclusions match and indicate a series of deposits laid down by a plant-rich Fenland river, a true ancestor of the present river Wissey, in its channel and neighbouring parts of its floodplain. The occurrence of brackish water species of Mollusca allows levels of marine influence to be clearly integrated with the vegetational history. Brackish horizons occur between — 1.95 m and + 0.45 m O.D. in zone IIbdeposits, giving an indication of sea-level at this stage. The zone III deposits, although at a lower level, show no trace of brackish influences and a possible oscillation of sea-level is inferred.Keywords
This publication has 8 references indexed in Scilit:
- Pollen analyses from interglacial deposits at Aveley and Grays, EssexProceedings of the Geologists' Association, 1969
- Interglacial deposits at Wortwell, NorfolkGeological Magazine, 1968
- Two Faunas and Floras from the alluvium at Shustoke, WarwickshireProceedings of the Linnean Society of London, 1965
- Interglacial deposits at Ilford, EssexPhilosophical Transactions Of The Royal Society B-Biological Sciences, 1964
- The interglacial deposits at Stutton, SuffolkProceedings of the Geologists' Association, 1963
- Coastal interglacial deposits of the English ChannelPhilosophical Transactions Of The Royal Society B-Biological Sciences, 1960
- INTERGLACIAL DEPOSITS AT TRAFALGAR SQUARE, LONDONNew Phytologist, 1960
- Stratigraphical and Paleontological Studies of Interglacial Fresh-water Deposits in Jutland and Northwest Germany. AtlasDanmarks Geologiske Undersøgelse II. Række, 1928