Subject ASC00010ta
The Quarterly journal of the Geological Society of London.
v.59 (1903), Page 69 (1903)
Smithsonian Libraries
BHL Page 41497000
Keywords
Geology Potholes Gneiss barrier Sketch Potholing of the gneiss-barrier Nile Semna Cataract geology Nile potholing potholes gneiss-barrier gneiss Semna Cataract Potholing Gneiss Barrier Flood Weathering