The London Chalk model

This report describes the work undertaken to produce the London Chalk Model (LCM) within the catchment of the River Thames. This work was funded by the Environment Agency, Thames Region, to support work on the production of a new hydrogeological model for the region. STRUCTURE OF REPORT The introduction describes the background to the project. The second chapter describes the sources for the data used in the model. An account is then given of the processes that led to the generation of the geological model; this includes notes on the criteria used to subdivide the Chalk according to the new lithostratigraphy and how faulting was elucidated. A discussion of the structure of the Chalk starts with observations on the kinds of influence exerted on the Chalk by tectonic structures, and on the difficulties of specifically identifying faults in the Chalk. The final chapter ends with a short discussion on the possible timing of fault movements and how fault movements may have influenced sedimentation of the Chalk.