| Computer Code: |
LSYS |
Preferred Map Code: |
notEntered |
| Status Code: |
Pending Upgrade |
| Age range: |
Tithonian Age (JI)
— Tithonian Age (JI) |
| Lithological Description: |
Lower Spilsby Sandstone Member. Coarse-grained, pebbly, glauconitic sands and sandstones with calcareous 'doggers' and occasional phosphatic nodules towards the top, this unit equates with the lower part of Swinnerton's (1937) 'Glauconitic Sands'. The base of the member comprises thin grey sandstone with phosphatic nodules (the Basement Beds of Swinnerton, 1937, and Beds A and D of Swinnerton, 1935). |
| Definition of Lower Boundary: |
A down-section change from grey sandstone with phosphatic nodules (the 'Basement Beds' of the lower Spilsby Sandstone Member) to mudstone (Kimmeridge Clay). |
| Definition of Upper Boundary: |
The top is taken where coarse-grained, pebbly, glauconitic sands and sandstones with calcareous "doggers" and sporadic phosphatic nodules towards the top (Lower Spilsby Sandstone) are overlain by medium-grained, buff and green sands with sparse calcareous "doggers" and a basal bed of phosphatic nodules and small (generally chert) pebbles of the Upper Spilsby Sandstone. An erosion surface separates the two units. |
| Thickness: |
none recorded or not applicable
|
| Geographical Limits: |
none recorded or not applicable
|
| Parent Unit: |
Spilsby Sandstone Formation (SYS)
|
| Previous Name(s): |
Lower Spilsby Sandstone [Obsolete Name and Code: Use LSYS]
(-4171)
|
| Alternative Name(s): |
none recorded or not applicable
|
| Stratotypes: |
| none recorded or not applicable |
| Reference(s): |
| Hopson, P M, Wilkinson, I P and Woods, M A. 2008. A stratigraphical framework for the Lower Cretaceous of England. British Geological Survey. British Geological Survey Research Report, RR/08/03. |
| Swinnerton, H H. 1937 (for 1936). A monograph of British Cretaceous Belemnites, Part 11. Monograph of the Palaeontographical Society. |
| Swinnerton, H H. 1935. The rocks below the Red Chalk of Lincolnshire and their cephlopod fauna. Quarterly Journal of the Geological Society, London, 91, 1-46. |
| 1:50K maps on which the lithostratigraphical unit is found, and map code used: |
| none recorded or not applicable |
