sentences:  It was during his work as a surveyor, that Young, an amateur geologist too, discovered the potential of a limestone found at Mumbles, Swansea, Glamorganshire being fashioned as marble.In 1814, Thomas Mansel Talbot (1747–1814) (father of Christopher Rice Mansel Talbot (1803–1890)) died at Penrice, Gower, Glamorganshire and Young was commissioned to design Talbot's tomb using locally-sourced minerals.The tomb is a large and elaborate edifice, deploying Penrice alabaster and Mumbles marble, and took a whole six years of design and modelling before its completion in February 1820 in the nave of Margam Abbey Church, Margam, Glamorganshire.