Computer Code: | HETD | Preferred Map Code: | SYMB |
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Status Code: | Full | ||
Age range: | Pleistocene Epoch (QP) — Holocene Epoch (QH) | ||
Lithological Description: | Gravels, sands and loams that underlie the Hemington Terrace. Forms a terrace typically c.0.5 to 1m above the modern floodplain in the type area, and often distinguishable from the latter by the presence of mediaeval ridge and furrow. Generally comprises a lower unit of planar cross-bedded (laterally accreted, meandering river) gravel (up to 5m) and an upper unit of overbank silt (up to 2m); may also include organic muds in channels at the base. Gravel much as Holme Pierrepont Sand and Gravel, i.e. dominated by rounded pebbles of "Bunter" quartz/quartzite (c.80%) with subordinate subangular flint, etc., but typically less sandy and orange-brown (not pinkish). | ||
Definition of Lower Boundary: | Unconformable, commonly channelled base, resting (generally) on Holme Pierrepont Sand and Gravel or (more locally) pre-Quaternary bedrock. | ||
Definition of Upper Boundary: | Ground surface, or base of alluvium. | ||
Thickness: | 0 to c.7m; typically c.5m. | ||
Geographical Limits: | Extensively developed along much of the Trent, Derwent and Soar within Sheet 141 and 142; distribution elsewhere uncertain pending resurvey or revision, but probably present at least on adjoining sheets (?125, 126, 140, ?154, 156), where currently mapped mainly as alluvium. | ||
Parent Unit: | Trent Valley Formation (TRVA) | ||
Previous Name(s): | Hemington Member
(HETD)
Hemington Terrace Deposits (-3463) Ambaston Member (-311) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Hemington Quarry, Hemington Fields, Leicestershire. Brandon, 1996. | ||
Reference(s): | |||
Carney, J N, Ambrose, K and Brandon A. 2002. Geology of the Melton Mowbray district - a brief explanation of the geological map. British Geological Survey Sheet Explanation, Sheet 142 (England and Wales). | |||
Knight, D and Howard, A J. 2004. Trent valley landscapes. (King's Lynn: Heritage Marketing and Publications.) | |||
Bowen, D Q. 1999. A revised correlation of Quaternary deposits in the British Isles. Geological Society Special Report, No. 23. | |||
Carney, J N, Ambrose, K and Brandon, A. 2002. Geology of the Loughborough district. Sheet explanation of the British Geological Survey, Sheet 141 (England and Wales). | |||
Brandon, A, 1996. Geology of the Lower Derwent Valley: 1:10 000 Sheets SK33SE, SK43SW and SK43SE. British Geological Survey Technical Report WA/96/07. | |||
Salisbury, C R, Whitley, P J, Litton, C D and Fox, J L. 1984. Flandrian courses of the River Trent at Colwick, Nottingham. Mercian Geologist, Vol.9. 189-207. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
E141 E142 |