There are few dinosaurs specifically in fossil fuel. In order to become fossil fuel you need something that does not rot. There are a few things that could cause this. First plants were around before bacteria evolved to break them down, algae blooms saturates the oceans ability to break down algae and it falls down to the bottom of the ocean where there are no oxygen, when plants developed lignin that allowed them to for example make huge trees and strong grass there were no bacteria around to break down this lignin, lakes and bogs creates conditions with little oxygen for plants to fall down into, etc. In all these cases you get carbohydrates buried in layers of dirt and stone over a long time. The pressure and temperatures is able to do what the bacteria was not and will break the carbohydrates apart. But without additional oxygen they just reform into the simplest structures possible without oxygen which is hydrocarbons or coal.
It’s mostly algae and other plant matter, but yes; things that died a long time ago get buried and break down slowly into more basic hydrocarbons. Depending on the precise pressures and local geology involved, they turn into various hydrocarbon substances ranging from gases (e.g. methane and other natural gases), liquids (crude oil), and solids (i.e. coal).
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