Fossils of sea animals are very often found among coal. How is this explained ?

The rocks which occur above the coal seams were gradually deposited below sea-level. Remains of marine
animals would naturally fall into the old forests when they were in this position. Fossils result when these
remains are replaced, bit by bit, by material from the rocks above. The presence of these fossils is evidence
that the coal seams were once at least below sea Level.


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