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Books Books 1 - 3 of 3 on The structure is at the same time porphyritic and brecciated, being one characteristic....  
" The structure is at the same time porphyritic and brecciated, being one characteristic of a volcanic rock which after becoming hard had been subjected to mechanical movements. It is a volcanic breccia, but not an ash or tuff, the peculiar structure being... "
Records of the Geological Survey of India - Page 48
1889
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Transactions - Leeds Geological Association, Volumes 1-3

Leeds Geological Association - Geology - 1885
...however, "a large amount of the adjoining bituminous shale which has been more or less baked and altered. It is a volcanic breccia, but not an ash or tuff, the peculiar structure being apparently due to the successive paroxysmal eruptions." May not the vegetable matter that formed the probable source...
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A Manual of Practical Assaying

John Mitchell (F.C.S.) - Assaying - 1888 - 896 pages
...through the alteration of olivine into serpentine, being a genesis of rutile not heretofore observed. The chemical composition shows this to be one of the...movements. It is a volcanic breccia, but not an ash or tufl, the peculiar structure being apparently due to successive paroxysmal eruptions. A similar structure...
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Journal of Earth Sciences, Part 5

Geology - 1890
...however, "a large amount of the adjoining bituminous shale which has been more or less baked and altered. It is a volcanic breccia, but not an ash or tuff, the peculiar structure being apparently due to the successive paroxysmal eruptions." May not the vegetable matter that formed the probable source...
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