The Ancient Volcanoes of Great Britain, Volume 2 (of 2)

Note 314 — Chapter XLII · THE BASIC SILLS OF THE BASALT-PLATEAUX

Reading edition

Professor Judd has described what he calls a "glomero-porphyritic structure" in this rock (Quart. Journ. Geol. Soc. xlii. (1886), p. 71).

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