This layer or mat covers the Clovis-age landscape or surface on which the last remnants of the terminal Pleistocene megafauna are recorded.
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The black mat represents 4% of Earth’s vegetation at the time; most of the burning was caused by mega-fires burning out of control & creating firestorms. This period lasted most of 100 years.
It’s staggering to think that natural winters and rainy season rainfalls wouldn’t have put the fires out.