| Autor: |
M. E. Pettit, D. H. Keen, Cunhai Gao, G. Russell Coope |
| Rok vydání: |
1998 |
| Předmět: |
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| Zdroj: |
Proceedings of the Geologists' Association. 109:127-137 |
| ISSN: |
0016-7878 |
| DOI: |
10.1016/s0016-7878(98)80012-6 |
| Popis: |
Fluvial gravels exposed beneath the surface of the low terrace of the River Ivel have been investigated in a quarry south of Sandy, Bedfordshire. Sedimentological investigations suggest that deposition occurred as bars and sheets in a braided river regime. Fossiliferous silt lenses occur within the gravel and their contents indicate deposition under slow moving or still water conditions in abandoned small channels. The palaeontological data from plant macrofossil remains, Mollusca and Coleoptera present a consistent picture of a harsh climate similar to that of the tundra areas of arctic Russia at the present day. Mutual Climatic Range (MCR) estimates based on Coleoptera indicate a mean temperature of the warmest month between +8°C and +11°C, and a mean temperature of the coldest month between -10°C and -28°C. Radiocarbon ages of 34 055+330-310 (Q-2936) and 29 250+460-420 (Q-2935) yrs BP suggest dates for the lower part of the gravelly sequence, in the Middle Devensian, at the end of the Upton Warren Interstadial Complex. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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Full Text from ScienceDirect