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Updated: May 19, 2025
A bed between twenty and thirty feet thick, quite conformable with the underlying ones, composed of a hard basis, tinged lilac-grey porphyritic with NUMEROUS crystals of whitish feldspar, with black mica and little spots of soft ferruginous matter: evidently a submarine lava. 12th. Yellow magnesian limestone, as before, part-stained purple. 13th.
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