a. Remains of a submerged forest, composed of a tangled mass of brushwood
and tree trunks and forming a layer from 3 to 8 ft (0.9 to 2.4 m) thick.
Tomkeieff b. Hard, brown peat dredged by fishing boats from the bed of the North
Sea. Arkell
Source:
Dictionary of Mining, Mineral, and Related Terms
