I read that the oxygen content of the atmosphere was significantly higher then:
"The atmosphere of the Earth 80 million years ago was discovered to have 50% more oxygen than modern air. Brenner and Landis found that for all gas samples taken from amber 80 million years old the oxygen content ranged between 25% to 35% and averaged about 30% oxygen".
"The atmosphere of the Earth 80 million years ago was discovered to have 50% more oxygen than modern air. Brenner and Landis found that for all gas samples taken from amber 80 million years old the oxygen content ranged between 25% to 35% and averaged about 30% oxygen".
From: https://www.npl.washington.edu/av/altvw27.html
Sounds like being supercharged with oxygen could support larger mass on land.
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