The BGS Lexicon of Named Rock Units — Result Details

Selham Ironshot Sands Member

Computer Code: SIS Preferred Map Code: SIS
Status Code: Full
Age range: Aptian Age (KP) — Aptian Age (KP)
Lithological Description: Sand, purplish-reddish-brown, cross-bedded, poorly-sorted, medium- to coarse-grained, with polished dark brown to black limonite grains to granule size locally and secondary iron-pan concretions in parts. From about 9km from Stedham, West Sussex [SU 86 22] to east of Selham, West Sussex [SU 94 20] the Fittleworth Member is divided by the Selham Ironshot Member. Samuel (1994) proposed the name "Upper Fittleworth Beds" for these superposed beds (c.2m thick).
Definition of Lower Boundary: The base is a sharp junction between the purplish to reddish brown medium- to coarse-grained sand of the member with the sandy clay (which includes some limonite grains at this level) of the lower part of the Fittleworth Member.
Definition of Upper Boundary: The upper boundary is a sharp junction of sand overlying the upper part of the Fittleworth Member (pale sandy clay, non-ferruginous, becoming very dark greenish-grey where thinning out) or of hardground-like ferruginous sandstone with fine well-sorted sand of the Pulborough Sandrock, where the Fittleworth Member is absent.
Thickness: Between 0 to 24.4m (passes laterally into "loams", Fittleworth Member or Rogate Member to the west).
Geographical Limits: West Sussex:, from Cowdray Park in the north, possibly as far as Ambersham Common in the south, possibly also as far as the Stedham area in the west, to about 1km east of Selham in the east.
Parent Unit: Sandgate Formation (SAB)
Previous Name(s): Selham Ironshot Sands (*328)
Alternative Name(s): none recorded or not applicable
Stratotypes:
Reference Section  Within the sunken lane south from A272 to Moorland Barns [SU 9175 2180 to SU 9170 2145], Easebourne-Lodsworth parish boundary, near Midhurst. 
Type Area  Selham, near Petworth, Sussex. The unit forms relatively high ground on the south side of the River Rother extending from southeast of Selham westnorthwestwards nearly to Midhurst, and on the north side of the Rother from Halfway Bridge across Cowdray Park to Midhurst. The form of the deposit appears to be that of a large-scale lens or channel, up to about 25m in thickness and with a maximum outcrop width of about 8km. (Aldiss, 2002). 
Reference(s):
Kirkaldy, J F. 1933. The Sandgate Beds of the Western Weald. Proceedings of the Geologists' Association, Vol.44, 270-311. 
Reid, C. 1903. The geology of the country around Chichester. Memoir of the Geological Survey of England and Wales. Sheet 317 (England and Wales). 
Bristow, C R and Wyatt, R J. 1983. Geological notes and local details for 1:10 000 sheets TQ01NW, NE, SW and SE (Pulborough and Storrington). British Geological Survey Technical Report, WA/VG/83/03. 
Humphries, D W. 1964. The stratigraphy of the Lower Greensand of the south-west Weald. Proceedings of the Geologists' Association, Vol.75, 39-59. 
Young, B, Highley, D E and Morgan, D J. 1979 Calcium montmorillonite (Fuller's Earth) deposits in the Lower Greensand of the Tillington area, West Sussex. Open-file Report, Institute of Geological Sciences, No. 1979/1. 
Samuel, M D A. 1994. Geological notes and local details for 1:10,000 sheets SU82SE, SU92SW and SU92SE (Midhurst, Lodsworth and Petsworth). British Geological Survey Technical Report, WA/94/28. 
Woolridge, S W. 1947. Whitsun Field Meeting to the Central Weald, Haslemere and Midhurst. Proceedings of the Geologists' Association, Vol.58, 73-76. 
Thurrell, R G, Worssam, B C and Edmonds, E A. 1968. Geology of the country around Haslemere. Memoir of the British Geological Survey, sheet 301 (England and Wales). 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E300 E301 E317 E332