This report describes the geological observations and interpretations made following two reconnaissance field trips in October 2017 and April 2018 by Maarten Krabbendam and Romesh Palamakumbura, in the central Cauvery catchment in South India. The goal of the reconnaissance was to provide geological constraints to hydrogeological modelling to be undertaken as part of the UPSCAPE Project. The main geological constraints dealt with are fractures and the character of the regolith