This spreasheet includes data to support the Figures and Tables in: Title: The influence of weathering on index properties and undrained shear strength for the Charmouth Mudstone Formation of the Lias Group at a site near Banbury, Oxfordshire, UK Journal: Quarterly Journal of Engineering Geology & Hydrogeology Authors: Dr Kevin M. Briggs, Dr Letisha Blackmore, Dr Aleksandra Svalova, Dr Fleur A. Loveridge, Prof. Stephanie Glendinning, Prof. William Powrie, Mr Simon Butler, Mr Nick Sartain Column headings are based on: Electronic Transfer of Geotechnical and Geoenvironmental Data (AGS4, Edition 4.1, December 2020) ISBN 978-0-9957482-1-7