The BGS Lexicon of Named Rock Units — Result Details
Buller's Hill Gravel Member
| Computer Code: | BHGR | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Thanetian Age (GT) — Bartonian Age (GB) | ||
| Lithological Description: | Unbedded, abraded flint gravels with subordinate clay bodies and sand beds. Flint fragments are up to 0.3m diameter, fragments of vein quartz, schorl (rock composed of tourmaline and quartz), quartzite and thermally-altered Carboniferous shale and chert are also present. This unit is interpreted to have been deposited in a fluvial environment; analysis of the clay matrix by Hamblin (1973) indicated incorporation of material reworked from the Tower Wood Gravel, and from Upper Palaeozoic rocks. | ||
| Definition of Lower Boundary: | The Buller's Hill Gravel, flint-rich gravels (as described in the lithology description) succeed the Tower Wood Gravel - a deposit of unbedded closely-packed unabraded flints in a matrix of clay and some sand. The boundary is marked by an unconformity and a variation in colour, with the overlying Buller's Hill Gravel being pale brown or pale grey, but typically darker than the underlying Tower Wood Gravel. | ||
| Definition of Upper Boundary: | The top of the Buller's Hill Gravel is in part removed by erosion, forming the modern land surface; elsewhere the flint-rich gravel of the Buller's Hill Gravel is succeeded by recent Head deposits of mixed lithology. | ||
| Thickness: | Up to 21 m. | ||
| Geographical Limits: | Occurs on both Great Haldon and Little Haldon in south Devon. | ||
| Parent Unit: | Haldon Gravel Formation (HGR) | ||
| Previous Name(s): | Buller's Hill Gravel Formation [Obsolete Name and Code: Use BHGR]
(-1354)
Buller's Hill Gravel [Obsolete Name and Code: Use BHGR] (-1984) Haldon Gravels [Obsolete Name and Code: Use BHGR] (-2607) Tertiary Beds [Obsolete Name and Code: Use BHGR] (-3848) Bovey Beds [Obsolete Name and Code: Use AGR, BHGR] (-3157) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Partial Type Section | Buller's Hill Quarry, in the northern part of Great Haldon Hill, near Exeter. Faces show up to 3m of material resting on the unabraded flint gravel of the Tower Wood Gravel Member. The junction has been much heaved and disturbed by periglacial action. Hamblin, 1973. | ||
| Reference(s): | |||
| Selwood, E B, Edwards, R A, Simpson, S, Chesher, J A, Hamblin, R J O, Henson, M R, Riddolls, B W and Waters, R A. 1984. Geology of the countryside around Newton Abbot. Memoir of the British Geological Survey, Sheet 339 (England and Wales). | |||
| De La Beche, H T, 1839. Report on the geology of Cornwall, Devon and west Somerset. Memoir of the Geological Survey. | |||
| Hamblin, R J O. 1969. The geology of the Haldon Hills. Unpublished PhD thesis, University of Exeter. | |||
| Hamblin, R J O. 1974. On the correlation of the Haldon and Aller gravels, south Devon. Proceedings of the Ussher Society, Vol.3, 103-110. | |||
| Ussher, W A E. 1913. Geology of the country around Newton Abbot. Memoir of the British Geological Survey, Sheet 339. (England and Wales). | |||
| Hamblin, R J O. 1973. The Haldon Gravels of South Devon. Proceedings of the Geologists' Association, Vol.84(4), 459-476. | |||
| Curry, D, Adams, C G, Boulter, M C, Dilley, F C, Eames, F E, Funnell, B M, and Wells, M K. 1978. A Correlation of Tertiary rocks in the British Isles. Geological Society of London Special Publication, Vol. 12, 1-72. | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| E339 | |||