Subject ASC0001210
The Quarterly journal of the Geological Society of London.
v.67 (1911), Page 419 (1845)
Smithsonian Libraries
BHL Page 39749301
Keywords
section geology shale sedimentary rock shale beds Pembryn Moel-y-garth Penbryn Dingle Tretnant Dingle mile Moelygarth Llandovery rocks Montgomeryshire cross-section Trefnant Dingle scale cutting