Subject ASC00010m4
The Quarterly journal of the Geological Society of London.
v.56 (1900), (1900)
Smithsonian Libraries
BHL Page 41487438
Keywords
geology shales conglomerates mudstones flags grits roads villages waterways Map of soil Rhayader pale shales Gafallt beds Gigrin mudstones Ddol shales Dyffryn flags Cerig Gwynion grits Cleaved dark shales Wales Gwastaden Group Caban Group Caban congromerates Dyffryn Flags Gerig Gwynion grits Shale geography gafallt Beds Grits Cleaved Dark shales