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A solid band marking a coal seam.
Also known as: Coal ornament, Seam pattern geology
On a geological section a coal seam is ornamented as a solid filled band, distinguishing it sharply from the sedimentary rocks above and below.
Is filled solid because a coal seam is usually thin at section scale, and a patterned ornament in a thin band becomes unreadable.
Contexts: Maps
A completely filled band running across the section, without internal pattern.