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slow weather


subterranean clouds of shale
in dream-seam of coal

Sections showing shape of masses of shale in the Block House Seam (Plate XXX, between pp 140-41), illustrating John Rutherford, his “The Coal-Fields of Nova Scotia,” in Transactions, North of England Institute of Mining Engineers, vol. 19 (1869-70).
Google Books image here;
discussion of these
masses of shale which intercept the workings in a very singular manner
and which
are often of the most fantastic forms at

15 October 2012
tags: coal; mining; reves; John Rutherford