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 Coal is formed from plant life buried in the Earth millions of years ago. Like Petroleum and natural gas, it is a carbon-based fossil fuel.  Coal is called a fossil fuel b â¦ ecause it was formed from the remains of vegetation that grew as long ago as 400 million years.
1 Coal is made of compressed plant debris and thus is a biochemical rock. However, since coal is often found interlayered with clastic rocks, we'll discuss coal with the clastic rocks.  Carbonate rocks include limestone, which is made of calcite (CaCO3), and dolostone , which is made of dolomite (CaMg(CO3)2).