Andrew Jenkinson describes himself as a "countryside interpreter" with a particular interest in the 'lie of the land' created by the rocks that underpin it. He has been leading guided walks in the Marches for 45 years, and has publisheed a number booklets including the "Mortimer Forest Geology Trail".

He will be joined by Robert Williams, a friend with whom he worked for six years on geology summer schools based at Lucton School. Robert is now retired after a teaching career in history and geography, which combined to give him an interest in the history of geology and in particular the role of Roderick Murchison whose defining work on The Silurian System in 1839 was based extensively on the area of the central Marches. Robert will discuss this at Aymestrey and its Great Quarry, and again as we walk from Croft Castle to the Croft Ambrey hill fort