Fossil energy sources on a young Earth-like planet

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On a young Earth-like planet in its Cambrian era, fossil energy sources such as peat may be present, but traditional fossil fuels like oil and natural gas are unlikely to have formed yet due to insufficient geological time. Methane clathrates, which can form without organic matter, could potentially be found in this environment, particularly in permafrost or offshore continental shelves. The discussion suggests that early colonizers would likely rely on renewable energy sources, nuclear power, or biomass rather than conventional fossil fuels, given the planet's developmental stage.
Czcibor
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I'm curious which kind of fossil energy sources could one find on a young Earth-like planet which is in its equivalent of Cambrian era.

Yes, I understand it's clearly too early for mining carbon. So presumably peat instead, right?

What about oil or natural gas? (EDIT: including more exotic sources like natural gas hydrates in permafrosts or on offshore continental shelves)

Or any colonizers would have to stick to renewables/nuclear/biomass?
 
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I don't know how likely they are to develop but have you considered Methane Clathrate?
since it does not appear to need organic masses to form?
 

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