Computer Code: |
RDBN |
Preferred Map Code: |
Rdbn |
Status Code: |
Full |
Age range: |
Aalenian Age (JA)
— Callovian Age (JC) |
Lithological Description: |
[Obsolete: use GOG, INO] Sequence of limestones, mudstones and silty sandstones. |
Definition of Lower Boundary: |
Unconformity at top of Lias Group; basal formation of Redbourne Group may be Northampton Sand, Grantham Formation or Lincolnshire Limestone. |
Definition of Upper Boundary: |
Top of Cornbrash/base of Kellaways Formation. |
Thickness: |
Averages 55 TO 65m in Type Area. |
Geographical Limits: |
East Midland Shelf area, Northamptonshire to Market Weighton area. |
Parent Unit: |
none recorded or not applicable
|
Previous Name(s): |
none recorded or not applicable
|
Alternative Name(s): |
none recorded or not applicable
|
Stratotypes: |
Type Area |
Redbourne area (north Lincolnshire/south Humberside). |
Reference Section |
Leadenham Quarry (part of Upper Lincolnshire Limestone and part of Lower, including base) (Sumbler and others, 1990). |
Reference Section |
Main Quarry, Ketton, (Richardson, 1939), including trial shaft in Quarry floor. |
Reference Section |
Walks Farm Borehole, Howell, near Hockington (TF14NE/18) from 98.37 to 122.29m, (Cornbrash to within top of Lincolnshire Limestone). |
Reference Section |
Copper Hill Quarry, Ancaster, showing Upper Lincolnshire Limestone and part of Lower Lincolnshire Limestone, (Sumbler and others, 1990). |
Reference Section |
Nettleton Bottom Borehole (TF19NW/54), 320.65 to 391.70m. |
Reference Section |
Metheringham Quarry (Metheringham and Blankney Members, 'Middle' or Upper part of Lower Lincolnshire Limestone). (Ashton, 1980). |
Reference(s): |
Gaunt, G D, Fletcher, T P and Wood, C J. 1992. Geology of the country around Kingston upon Hull and Brigg. Memoir of the British Geological Survey, sheets 80 and 89 (England and Wales). 172pp. |
1:50K maps on which the lithostratigraphical unit is found, and map code used: |
E080
E081
E089
E072
E090
E091
E115
|