The BGS Seabed Geology 10k: Bristol Channel v.2 digital map provides detailed and accurate characterisation of the seabed geology, based on seabed and shallow-subsurface data. This dataset incorporates three complementary map components (Substrate Geology, Structural Geology, and Geomorphology) presented at 1:10 000 scale, provided as discrete layers for viewing within a Geographic Information System (GIS). The bedrock geology is divided into 23 stratigraphical units: Aber Mawr Shale Formation (ABM); Avon Group (AVO); Bridport Sand Formation (BDS); Bishopston Mudstone Formation (BISHM); Charmouth Mudstone Formation (CHAM); Carboniferous Limestone Supergroup (CL); Devonian And Carboniferous Rocks (Undifferentiated) (DEVC); Devonian Rocks (Undifferentiated) (DEV); Dyrham Formation And Beacon Limestone Formation (Undifferentiated) (DYBN); Hangman Sandstone Formation (HASA); Inferior Oolite Group (INO); Lias Group (LI); Ludlow Rocks (Undifferentiated) (LUDL); Lavernock Shale Member (LVN); Milford Haven Subgroup (MIH); Mercia Mudstone Group (MMG); Pembroke Limestone Group (PEMB); Penarth Group (PNG); Porthkerry Member (PO); Skrinkle Sandstones Subgroup (SES); St Mary's Well Bay Member (STM); South Wales Lower Coal Measures Group (SWLCM); Triassic Rocks (Undifferentiated) (TRIA). The Lexicon code of the stratigraphical units is provided in parentheses, as defined in the ‘BGS Lexicon of Named Rock Units’. The superficial deposits mapped are comprised of only marine sediments (Marine Deposits Undifferentiated (MDU)) that were classified based on their grain size. The sediments are divided into Gravel (V): Sand (S); Mud (M); Sand and Gravel (XSV); Sand and Mud (XSM); and Gravel, Sand and Mud (XVSM). The RCS code of the stratigraphical units is provided in parentheses, as defined in the ‘BGS Rock Classification Scheme’.
