Compressed ball, half peat, half coal slack | Science Museum Group Collection
Fossil plants : for students of botany and geology . Paleobotany. IV] COAL- BALLS. 85 In the Coal-Measures of England, especially in the neigh- bourhood of Halifax in Yorkshire, and in South
A perfectly round “coal ball” found buried underground on a strip job. They're made from pockets of plant debris that were preserved 280 million to 325 million years ago. : r/mildlyinteresting