The BGS Lexicon of Named Rock Units — Result Details
Henshaw Formation
Computer Code: | HSW | Preferred Map Code: | HSW |
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Status Code: | Full | ||
Age range: | Sheinwoodian Age (SS) — Homerian Age (SH) | ||
Lithological Description: | Red medium- and coarse-grained sandstones and conglomerates with finer grained sediments. | ||
Definition of Lower Boundary: | Conformable: lowest pebble grit horizon immediately overlying red Wether Law Linn Formation shales. | ||
Definition of Upper Boundary: | Not seen - unconformably overlain by Greywacke Conglomerate Formation (lower 'Old Red Sandstone') and faulted against Kinnesswood Formation (Inverclyde Group). | ||
Thickness: | At least 725 m. | ||
Geographical Limits: | Pentland Hills, Midland Valley. | ||
Parent Unit: | North Esk Group (NSK) | ||
Previous Name(s): | Upper Red Sandstone
(URS)
Upper Argillaceous Beds (UARG) Middle Red Sandstone (MRS) Lower Argillaceous Beds (LARG) Bed D [Obsolete Name and Code: Use HSW] (-2856) Red Sandstone Series [Obsolete Name and Code: Use HSW] (-327) Beds At J To M [Obsolete Name and Code: Use HSW] (-4102) Red Igneous Conglomerate and Sandstone [Obsolete Name and Code: Use HSW] (-4103) Lower Red Sandstone [Obsolete Name and Code: Use YWS, HSW] (-3481) Upper Red Sandstone (URS) Upper Argillaceous Beds (UARG) Middle Red Sandstone (MRS) Lower Argillaceous Beds (LARG) |
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Alternative Name(s): | none recorded or not applicable | ||
Stratotypes: | |||
Type Section | Baddingsgill Reservoir shore section to Lyne Water, 20 m west of footbridge to 630 m NE of Little Hill summit. | ||
Reference Section | North Esk river and Henshaw Burn, 115 m to 225 m upstream from confluence. | ||
Partial Type Section | Top of Baddingshill Mudstone Member of Wether Law Linn Formation and base of Henshaw Formation, North Esk River, west bank 115 m upstream from confluence with Henshaw Burn. | ||
Reference(s): | |||
Peach, B N and Horne, J. 1899. The Silurian Rocks of Britain, Volume 1. Scotland. Memoir of the Geological Survey of the United Kingdom. | |||
Lamont, A, 1952. Ecology and correlation of the Pentlandian - a new division of the Silurian System in Scotland. 27-32 in Faunal and floral facies and zonal correlation. Dighton-Thomas, H (editor). Report of the 18th Session of the International Geological Congress, Great Britain, 1948, Pt.10. | |||
Robertson, G, 1986. North Esk Inlier. 174-185 in Lothian Geology. An Excursion Guide. McAdam, A D and Clarkson, E N K (editors). [Edinburgh: Scottish Academic Press.] | |||
Mitchell, G H. 1962. The geology of the neighbourhood of Edinburgh. (Explanation of Sheet 32) Third Edition. (Reprinted 1980). Memoir of the Geological Survey of Great Britain (Scotland). | |||
Henderson, J and Brown, D J, 1870. On the Silurian rocks of the Pentland Hills. Transactions of the Edinburgh Geological Society, Vol.1, 266-272. | |||
Howell, H H and Geikie, A, 1861. The Geology of the neighbourhood of Edinburgh (1st edition). Memoir of the Geological Survey, Scotland. | |||
Tipper, J C, 1976. The stratigraphy of the North Esk Inlier. Scottish Journal of Geology, Vol.12, Pt, 15-22. | |||
Robertson, G, 1989. A palaeoenvironmental interpretation of the Silurian rocks in the Pentland Hills, near Edinburgh, Scotland. Transactions of the Royal Society of Edinburgh: Earth Sciences, Vol.80, 127-141. | |||
1:50K maps on which the lithostratigraphical unit is found, and map code used: | |||
S032 S024 |