OR/14/039 Model workflow
|Mathers, S J, Terrington, R L, Waters, C N, and Thorpe S. 2014. The construction of a bedrock geology model for England and Wales. British Geological Survey Internal Report, OR/14/039.|
Construction of cross-sections is performed in the GSI3D section window. This displays all the required information including the topography along the section, the bedrock geology at surface or rockhead, boreholes, intersections of crossing sections with the intercepts for individual units, surface traces from existing models displayed as raster backdrops. Structure contour maps are displayed in the GSI3D map window which is dynamically linked to the section window.
The geological units are normally constructed as baselines drawn in order going down the stratigraphic stack. The sections progressively colour up as the units are added.
Workspaces for section construction were prepared by the data management team including the alignments of all the revised, new and existing cross-sections. Existing sections were cut and terminated at regional boundaries utilising a specially developed tool for use in GSI3D. Each regional geologist(s) then completed construction of their allocated set of cross-sections and checked them for internal consistency. The interpretations where then reviewed along the boundaries of regions by pairs of geologists to produce a consistent agreed interpretation from which a master dataset was compiled.
The entire model was then reviewed for stratigraphic cohesion and consistency as follows, units to base of Palaeogene by Steve Mathers, Cretaceous by Peter Hopson, Jurassic by Mark Barron, and all older units by Colin Waters. The entire dataset was then signed off by Steve Mathers as project manager. The checking and sign-off are also recorded in the section database.
Geologists responsible for individual regions are listed in Table 1 and the regional areas are shown in Figure 14.
The revision of the England-Scotland border area was finally completed and the new GB3D_V2014 dataset was compiled.
|Northern England||David Millward|
|Pennines & adjacent areas||Colin Waters|
|Eastern England||Jon Ford|
|Central England, and Bristol & Gloucester||Mark Barron|
|Welsh Borders||Oliver Wakefield|
|South West England||Richard Haslam|
|Wales||David Schofield, Phil Wilby|
|Hants Basin, and Weald||Peter Hopson|
|East Anglia, and London-Thames||Steve Mathers|
|Stratigraphic review||Colin Waters, Mark Barron, Peter Hopson, Steve Mathers|
|England-Scotland border review||Colin Waters, David Millward|
|QA and sign-off||Steve Mathers|
The revised model produced by this study for England and Wales is shown in Figure 15 and comprises part of the new GB3D_v2014 dataset. The dataset is freely available in a variety of formats from the BGS website at: http://www.bgs.ac.uk/research/ukgeology/nationalGeologicalModel/GB3D.html
- Kessler, H, and Mathers S J. 2004. Maps to models. Geoscientist 14/10 4-6. http://nora.nerc.ac.uk/983/
- Kessler, H, Mathers, S J, and Sobisch, H-G. 2009. The capture and dissemination of integrated 3D geospatial knowledge at the British Geological Survey using GSI3D software and methodology. Computers & Geosciences, 35, 1311–1321. http://dx.doi.org/10.1016/j.cageo.2008.04.005