Have not looked into that. What makes the most sense to me is this:

• 4.5 billion years ago, Solar System is formed and Earth is a product of that.
• For the first 1 billion years, there is violent activity that is not hospitable for life, but the atmosphere is forming.
• Over the next 3 billion years, single cell organisms form, and they breathe in the noxious gases from the Earth's formation -- amonium, nitrogen, etc. -- and they breath out oxygen and carbon dioxide, putting those gasses into the atmosphere.
• 500 million years ago, after 3 billion years of pumping out oxygen and carbon dioxide, there is enough of these molecules in the atmosphere that the Cambrian Explosion happens.

Those early microorganisms probably died off, though some of them may have continued and/or evolved in some way to still be present today as bacteria and other similar microorganisms.

I don't think there can be any serious debate about the fact that the Cambrian Explosion did, in fact, start a process of life as we know it into many diverse forms of animals and plants.

Beyond that, it seems you might be implying that fossils could have laid a foundation that today results in so-called "fossil fuels." Maybe you are not going there, but if you are, I would respond by stating that petroleum is not a fossil fuel. Fossil fuels do not exist.

https://greatawakening.win/p/12kFZBAP0G/