How bituminous coal fields were formed?

Answer 1

They were formed from the remains of the prolific plant material growing in vast marshy areas in the Carboniferous. The plant remains did not rot in their shallow water environment and formed layer after layer of sediment which was eventually covered with subsequent layers of additional sediments resulting in their compaction and cementation in a process of lithification.

Answer 2

Bituminous coal fields were formed millions of years ago from the remains of ancient swamp forests that were buried by layers of sediment. Over time, heat and pressure transformed the organic material into coal. The presence of specific geologic conditions, such as tectonic activity and depositional environments, also played a role in the formation of bituminous coal fields.