* Abundant plant growth: These environments need to support a dense and rapid growth of vegetation, primarily trees, ferns, and other wetland plants.

* High water table: This prevents the decomposition of dead plant material, allowing it to accumulate and form peat.

* Low oxygen levels: The waterlogged conditions create an anaerobic environment, which further hinders decomposition.

* Consistent sediment deposition: Fine-grained sediment, such as clay and silt, settle over the peat, preserving it and eventually forming coal.

Specific types of depositional environments that favor coal formation:

* Coastal swamps: These are found near the coast, often in river deltas or estuaries, where fresh and salt water mix.

* Inland swamps: These are located further inland, typically in areas with high rainfall and poor drainage.

* Bogs: These are acidic, waterlogged environments characterized by sphagnum moss and other adapted vegetation.

Conditions that might hinder coal formation:

* High-energy environments: Strong currents, waves, or storms can disrupt the accumulation of peat and prevent coal formation.

* Dry climates: Lack of rainfall or water availability can prevent the development of the necessary swampy conditions.

It's important to note: Coal formation is a complex process that takes millions of years. It involves the accumulation, compaction, and transformation of organic matter under specific geological conditions. The type of coal produced (anthracite, bituminous, lignite) depends on the degree of heat and pressure applied over time.