A plank is a flat piece of timber, sawn and planed; it is technically distinguished from a board[?] by its greater thickness, and should measure from 2 to 4 inches (5.08 to 10.16 cm) in thickness and from 10 to 11 inches (25.4 to 27.94 cm) in width.
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... Tertiary conglomerates, sandstones, marls and clays, folded by subsequent upheavals, in many parts of the island. The clays, which contain layers of good coal ...