The London Basin superficial and bedrock LithoFrame 50 Model

This report describes the methodology and datasets used in the construction of the 1:50 000
resolution superficial and bedrock geological model of the London Basin.
The London Basin study area was divided into twelve 20 x 20 km tiles, with construction of the
first tiles beginning in 2006 and completion of the combined model in 2014. This time period
coincided with the ongoing development of GSI3D software which was used to construct much
of the model. The GSI3D software was used to calculate a rockhead (base Quaternary and
Anthropocene) surface that was then used as a capping surface for the modelling of the bedrock
geology in the GOCAD® software.
The model complements the corresponding DiGMapGB-50 tiles of the area and consists of about
80 modelled geological units, comprising mass movement (landslip), artificial, superficial, and
bedrock.
This report supersedes an earlier report detailing the construction of the superficial part of this
model (Burke et al. 2013).
A glossary of technical terms used is included at the end of this report.