The BGS Lexicon of Named Rock Units — Result Details

Rogate Member

Computer Code: RGTB Preferred Map Code: RoB
Status Code: Full
Age range: Aptian Age (KP) — Aptian Age (KP)
Lithological Description: The member is a heterogeneous succession of coarse-grained pebbly sands, very glauconitic clayey pebbly sands, glauconitic pebbly and sandy clays, calcareously cemented pebble beds and coarse-grained pebbly sands with many polished limonite pebbles.
Definition of Lower Boundary: The base is taken at the top of the Hythe Formation and is marked by the incoming of pebbles (including pebbles of polished limonite), usually set in a slightly clayey, glauconitic sandy matrix.
Definition of Upper Boundary: The upper boundary is conformable at the base of the Pulborough Sandrock Member, marked by the top of a glauconitic pebbly sandy clay where present and elsewhere at the change from pebbly sands to the fine-grained, well-sorted Pulborough Sandrock Member (but note scattered coarse grains occur in the basal metre or so of the Sandrock).
Thickness: 4 to 46m.
Geographical Limits: Western Weald; outcrop extends from Stedham, West Sussex, to north of Liss in Hampshire.
Parent Unit: Sandgate Formation (SAB)
Previous Name(s): Selham Ironshot Sands (*328)
Rogate Beds (-492)
Sandgate Beds (Undifferentiated) (-4297)
Alternative Name(s): Selham Ironshot Sands
Stratotypes:
Type Area  Rogate village and surroundings (Bristow, 1991). 
Reference(s):
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. 
Bristow, C R. 1991. Geology of the Petersfield District, Hampshire. Explanation of 1:10,000 Geological sheets SU72NW, 72NE, 72SW, 72SE, 82NW and 82SW. British Geological Survey Technical Report, WA/91/24. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
E300 E317 E332