The BGS Lexicon of Named Rock Units — Result Details
Fulbeck Sand and Gravel Member
| Computer Code: | FULB | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Late Pleistocene (QPL) — Late Pleistocene (QPL) | ||
| Lithological Description: | Predominantly cold-phase sands and gravels that underlie the Fulbeck Terrace. Typically a clean, well-sorted medium-grained sand with gravel that at depth is dominated by subangular and subrounded pebbles of Jurassic limestone (mainly Lias Group and Lincolnshire Limestone Formation), with a smaller proportion of other Jurassic lithologies, flint, "Bunter" quartz/quartzite, etc., derived from older drift deposits. Commonly appears dominated by "Bunter" and flint pebbles near the surface due to decalcification. Infills a shallow channel partly coinciding with the valley of the modern River Brant, extending northnortheastwards from Woolsthorpe to Auborne. Terrace surface falls to c. 6 m OD at the northern end where the deposits are covered by Brant alluvium and probably are truncated by the deeper channel of the River Witham. Sections show cryogenic involutions and epigenetic ice wedge casts infilled with coversand. Basal part locally includes channel-filling organic silts (Little Syke Bed), which yield a temperate fauna and flora assigned to MIS 5e. Correlated with Beeston Sand and Gravel Member (Trent Valley Formation), and Scarle Sand and Gravel Member (Trent Valley Formation). Upper Pleistocene (MI Stage 5e to 4 or ?2). It was originally thought (Brandon and Sumbler, 1988) that essentially the whole of the deposit was Ipswichian but subsequently it became clear that the temperate fossiliferous deposits were local basement remnants and that the bulk of the deposit was a cold-stage aggradation. This is probably largely MIS 4, but could extend into MIS 2 (and could therefore in part correlate with the Holme Pierepont Sand and Gravel of the Trent). | ||
| Definition of Lower Boundary: | Unconformable, commonly channelled base, resting on pre-Quaternary bedrock. | ||
| Definition of Upper Boundary: | Ground surface or (chiefly at northern limit) overlain by alluvium. | ||
| Thickness: | 0 to c. 5 m; typically 1 to 2 m. | ||
| Geographical Limits: | Woolsthorpe-by-Belvoir [SK 84 34] to Auborne [SK 93 63] BGS sheets:142, 143, 127, 114). | ||
| Parent Unit: | Trent Valley Formation (TRVA) | ||
| Previous Name(s): | Older river sand and gravel
(ORSG)
Fulbeck Sand and Gravel [Obsolete Name and Code: Use FULB] (-4054) Glacial sand and gravel [Obsolete Name and Code] (GSG) Older river sand and gravel (ORSG) Bassingham Fen Member [Obsolete Name and Code: Use FULB] (-266) Fulbeck Member [Obsolete Name and Code: Use FULB] (-267) River Terrace Deposits, Undifferentiated (-919) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Area | Fulbeck Airfield area, Lincolnshire. Brandon and Sumbler, 1988. | ||
| Reference(s): | |||
| Brandon A, and Sumbler, M G. 1991. The Balderton Sand and Gravel: pre-Ipswichian cold stage fluvial deposits near Lincoln, England. Journal of Quaternary Science, Vol. 6. 117-138. | |||
| Brandon, A, and Sumbler, M G. 1988. An Ipswichian fluvial deposit at Fulbeck, Lincolnshire and the chronology of the Trent terraces. Journal of Quaternary Science, Vol. 3, 127-133. | |||
| Howard, A J. 1992. The Quaternary Geology and geomorphology of the area between Newark and Lincoln. Unpublished PhD Thesis, University of Derby. | |||
| Howard, A J, Keen, D H and Hollin, J T. 1999. Amino acid dating of a molluscan fauna from Bassingham Fen, Lincolnshire: implications for the chronology of the Trent terraces. Proceedings of the Geologists' Association, Vol.110. 233-239. | |||
| Sumbler, M G and Brandon, A. 2000. Correspondence: amino acid dating of a molluscan fauna from Bassingham Fen. Proceedings of the Geologists' Association, Vol.111. 373-374. | |||
| Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. | |||
| Jackson, I. 1977. The sand and gravel resources of the country west and south of Lincoln, Lincolnshire: description of 1:25 000 resource sheets SK95 and part of SK96 and SK97. Mineral Assessment Report, Institute of Geological Sciences, No.27. | |||
| Berridge, N G, Pattison, J, Samuel, M D A, Brandon, A, Howard, A S, Pharaoh, T C, and Riley, N J. 1999. Geology of the Grantham district. Memoir of the British Geological Survey, sheet 127 (England and Wales). | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E127 E114 E142 E143 | |||