Over great areas the former profusion of swamp vegetation ceased, and, overlaid by these newer deposits, it began that process of compression and mineralization that gave the world most of the coal deposits of to-day.
(the former profusion of swamp vegetation; ceased; L:Over great areas) (it; began; that process of compression and mineralization that gave the world most of the coal deposits of to-day) (that process of compression and mineralization; gave; the world; most of the coal deposits of to-day)
the former profusion of swamp vegetation it that process of compression and mineralization
ceased began gave
L:Over great areas
that process of compression and mineralization that gave the world most of the coal deposits of to-day
the world most of the coal deposits of to-day