Subject ASC0003s9y
The geological magazine, or, Monthly journal of geology.
[Decade 1]:v. 4 (1867), Page 252 (1867)
Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
BHL Page 32512101
Keywords
geology River Tanat strata Cwmgwynnen mine Llanfyllin Wales shale limestone mine schist rock stone cross-section feldspar iron pyrites levels Strata Section Section of strata at Cwmgwynnen mine north-west of Llanfyllin