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Three types of cycles are recognized for the Pennsylvanian rocks of the Appalachian basin: 1) autocycles (river avulsion and shifts in supply); 2) sub-regional allocycles (tectonism within the basin or uplift of parts of the orogenic belt; and 3) regional and eustatic allocycles (regional tectonism or eustasy). Autocycles occur within minor allocycles and are interpreted as sediment-supply shifts accompanying river avulsions within relatively fixed-drainage basins. Minor allocycles of coal measures commonly are 18 to 30 meters in thickness and contain extensive paleosols, coal, marine and/or freshwater limestone beds. Current estimates of allocycle durations vary greatly depending on the time...

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