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Formation of limestone, coal, oil and gas

Key ideas • Evolution of the Earth's atmosphere

Key concepts

What you'll likely be quizzed about

  • Sedimentary deposits originate from the accumulation of biological or chemical materials, followed by burial and compaction into rock or fuel.
  • The raw material derives from biological remains or organic matter.
  • Through sedimentation, this material becomes buried, enabling chemical and physical transformations to occur.
  • The final type of deposit is determined by geological time, burial depth, and the geochemical environment.

Flashcards

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Why coal formation requires long timescales

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Coal forms over millions of years through prolonged burial and incremental heating that chemically transforms peat into coal.

Key notes

Important points to keep in mind

Limestone forms from calcium carbonate shells and skeletons on seabeds.

Coal originates from plant material that becomes peat in anaerobic swamps and undergoes carbonification.

Crude oil and natural gas develop from plankton-rich sediments undergoing thermal cracking.

Anaerobic conditions and rapid burial enhance organic material preservation.

Temperature and burial depth dictate whether organic matter evolves into coal, oil, or gas.

Porosity, permeability, and impermeable cap rock influence hydrocarbon accumulation.

High oxygen levels reduce the likelihood of coal or hydrocarbon source rock formation.

Sediment supply and biological activity determine deposit sizes.

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