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
p146
15 October 2012
tags: coal; mining; reves; John Rutherford