'Original entry: Internal Plug Of Porphyritic Basalt Agm Basalt Jer'
Stratigraphy
Not entered
Comments
Junction of gabbro and porphyritic basalt (S. 20020); two types of porphyritic basalt which centred gabbro neck, either as an (?) or an earlier intrusion; intermediate between Dalmeny and Craiglockhart types, but note albite and epidote; see also S.