Was coal formed in the early cenozoic era or the late cenozoic era?

Question

I need this for a science project and have looked everywhere but still cannot find it. I know that coal is formed from swamp ferns that died in the late palezoic era, but it takes millions of years to turn into coal. Please help!

Answer 1

Late Cenozoic era (Quarternary period). Formation of coal = 300 million years...

check out the which era...

http://www.mun.ca/biology/scarr/Geological_Eras_Periods_&_Epochs.htm

Answer 2

Coal formation started as early as the Proterozoic and continues today in swamps such as the Okefenokee swamp in southern Georgia. Check out the link below.