| Computer Code: |
FIB |
Preferred Map Code: |
FiB |
| Status Code: |
Full |
| Age range: |
Aptian Age (KP)
— Aptian Age (KP) |
| Lithological Description: |
Glauconitic sandy clays and clayey sands: orange-brown where weathered; bright green where unweathered. |
| Definition of Lower Boundary: |
The lower boundary is marked by the incoming of conspicuous glauconitic clayey sands and sandy clays on fine-grained to medium-grained "Bargate Beds" (now Easebourne Member) where present. |
| Definition of Upper Boundary: |
In the area from Stedham to Storrington the upper boundary is marked by the change from glauconitic sandy clay and clayey sand upwards into fine-grained well-sorted sands of the Pulborough Sandrock. From Storrington eastwards the boundary is diffuse at the upward passage into silty clay of the Marehill Clay Member. |
| Thickness: |
10 to 60m. |
| Geographical Limits: |
From Stedham, West Sussex [SU 86 22] (where the combined Fittleworth Member and Selham Ironshot Sands Member are replaced by the Rogate Member) and probably eastwards to Heath Common [TQ 11 14]. From about 9 km 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 the upper division (c.2m thick). This is re-named informally the "upper Fittleworth Member", with the lower division (to c.8m) named the "lower Fittleworth Member". |
| Parent Unit: |
Sandgate Formation (SAB)
|
| Previous Name(s): |
Fittleworth Beds [Obsolete Name and Code: Use FIB]
(-249)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| Reference Section |
Hoes Farm Borehole SU91NE/19 gives a basal section. "The only detailed, albeit incomplete, section in this member is provided by the Hoes Farm Borehole [SU9808 1962] (Bristow et al., 1987). There, 18.35m of friable glauconitic, silty, fine-grained sandstone rests on a similar sandstone, 4.3m thick, with a rich and varied "Bargate-type" fauna. At the base of the latter sandstone, a 0.3m bed of sandy limestone overlies 0.4m of dark grey siltstone, which in turn rests on an eroded surface of the Hythe Formation." (Aldiss, 2002). |
| Partial Type Section |
A former brickpit at Fittleworth village. Current state not known but see Aldiss (2002). |
| Reference(s): |
| 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. |
| Aldiss, D T. 2002. Geology of the Chichester and Bognor district. Sheet Explanation of the British Geological Survey, 1:50 000 Series Sheet 317 and Sheet 332 (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. |
| Bristow, C R, Morter, A A, and Wilkinson, I P. 1987. The stratigraphy and palaeontology of the Lower Greensand of the Hoes Farm Borehole, near Petworth, Sussex. Proceedings of the Geologists' Association, Vol. 98(3), 217-227. |
| Young, B and Lake, R D. 1988. Geology of the country around Brighton and Worthing. Memoir of the British Geological Survey, Sheet 318 and 333 (England and Wales). |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
|
E317
E318
E332
E333
|
