Geologic Epochs

Source Notes

• 2026-04-23: What happened to oxygen levels as well as co2 during the epoch when fossil fuels were being created? During the geologic epochs when fossil fuels were being formed—primarily the Carboniferous and Permian periods (roughly 360 to 250 million years ago)—atmospheric oxygen and carbon (What happened to oxygen levels as well as co2 during the epoch when fossil fuels were being created)