OR/13/001 Modelled surfaces/volumes
Geological units in the model are as follows:
|wmgr||Worked and made ground|
|stobco||Shoreface and beach upper layer (along coast)|
|alv||Main Freshwater Alluvium|
|itdu||Intertidal Deposits undifferentiated|
|stob||Shoreface and beach deposits lower layer|
|isc||Interglacial silt and clay|
|head1||Head (silt reworked loess?)|
|brk||Brickearth (local overbank deposits on terraces)|
|rtdu||River Terrace Deposits undifferentiated|
|lde1||Lacustrine deposits (Clacton and Marks Tey)|
|gstc||Glacial Silt and Clay supramain till|
|gsg||Glacial Sand and Gravel supramain till|
|loft||Lowestoft Till (main sheet)|
|gstcb1||Glacial Silt and Clay below till 1|
|gsgb1||Glacial Sand and Gravel below till 1|
|gcd||Glacial Channel deposits|
|igd||Interglacial deposits (Little Oakley)|
|kes||Kesgrave Sand and Gravel|
|rcg||Red Crag Formation|
|llte||Lower London Tertiaries|
|ck||Chalk Group undiff|
|gsg1t||Glacial Sand and Gravel in main till sheet (top)|
|gsg1||Glacial Sand and Gravel in main till sheet (base)|
The sequence shares a common *.gvs with the adjacent Ipswich-Sudbury area model.
Multiple layers of storm beach deposits were needed to cope with interdigitated sequences and Holocene evolution. The Anglian glacigenic sediments shown above in blue comprise the Lowestoft Formation and within them a single lens is identified (gsg1). Legend colours in many cases loosely correspond to the 50K published map sheets. The difficulty in separating the thin Thanet Sand Formation from the Reading Formation (Lambeth Group) has resulted in the use of the older Lower London Tertiaries term being used for this package of strata. The Harwich and London Clay Formations cannot be mapped out separately and are lumped together as the Thames Group.
The model abuts the Ipswich-Sudbury model to the north (Mathers, 2012), shared docker sections ensure a common interpretation along the join at northing 30.
- MATHERS, S J. 2012. Model metadata summary report for the Ipswich-Sudbury LithoFrame 10-50 model. British Geological Survey Open Report OR/12/080.