The BGS Lexicon of Named Rock Units — Result Details
Byth Till Formation
| Computer Code: | BYTIL | Preferred Map Code: | notEntered |
|---|---|---|---|
| Status Code: | Full | ||
| Age range: | Devensian Stage (QD) — Devensian Stage (QD) | ||
| Lithological Description: | Gravelly, slightly clayey, silty sand diamicton. Interpreted as a subglacial till. Dark reddish brown, weakly calcareous, matrix supported. Clast lithologies are dominated by quartzite, psammitic metasedimentary rocks and red Devonian sandstones and shale. Clasts are typically subangular to subrounded and Devonian shale lithologies are striated. Clast fabrics indicate glacial transport from the west. Interpreted as a subglacial till. | ||
| Definition of Lower Boundary: | The lower boundary of the unit is sharp, planar, subhorizontal unconformity on gravels of the Howe of Byth Gravel Formation. To the west of the Howe of Byth quarry the Byth Till has been observed sharply unconformable on Devonian red sandstones. | ||
| Definition of Upper Boundary: | The upper boundary of the formation is a sharp, undulatory (relief up to 1m) erosional unconformity overlain by the Auchmeddon Gravel Formation. | ||
| Thickness: | To 3m | ||
| Geographical Limits: | Buchan, northeast Scotland. The formation is known from the vicinity of the Howe of Byth quarry on Sheet 97 (Fraserburgh), but may be regionally significant and present locally across northeast Scotland. | ||
| Parent Unit: | East Grampian Glacigenic Subgroup (EGD) | ||
| Previous Name(s): | Byth Till Formation
(BYTIL)
Blyth Member [Obsolete Name and Code: Use BYTIL] (-2658) Byth Till Formation (BYTIL) Byth Till [Obsolete Name and Code: Use BYTIL] (-1412) |
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| Alternative Name(s): | none recorded or not applicable | ||
| Stratotypes: | |||
| Type Section | North face (as at May 2000) of Howe of Byth quarry, 18km southwest of Fraserburgh, Buchan, northeast Scotland. Hall et al., 1995. | ||
| Reference(s): | |||
| Connell, E R. 2002. Stratigraphical investigations at three key Quaternary sites in northeast Scotland. Quaternary Newsletter, 98, 29-32. | |||
| Duller, G A T, Wintle, A F and Hall, A M. 1995. Luminescence dating and its application to key-pre-Late Devensian sites in Scotland. Quaternary Science Reviews, Vol.14, 495-519. | |||
| Hall, A M, Duller G A T, Jarvis, J and Wintle, A G. 1995. Middle Devensian ice-proximal gravels at Howe of Byth, Grampian Region. Scottish Journal of Geology, Vol.31, 61-64. | |||
| Merritt, J W, Connell, E R and Bridgland, D R (editors). 2000. The Quaternary of the Banffshire Coast and Buchan; Field Guide. (London: Quaternary Research Association.) | |||
| Merritt, J W, Auton, C A, Connell, E R, Hall, A M and Peacock, J D. 2003. The Cainozoic geology and landscape evolution of north-east Scotland. Memoir of the British Geological Survey, Sheets 66E, 67, 76E, 77, 86E, 87W, 87E, 95, 96W, 96E and 97 (Scotland) | |||
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
| none recorded or not applicable | |||