On what timescale? I think on the correct timescales biomass tracks what the environment supports. I'm not a geologist or biologist, but I have the impression

On what timescale? I think on the correct timescales biomass tracks what the environment supports. I'm not a geologist or biologist, but I have the impression that estimating biomass from fossil records is difficult. We do know that the oxygen boosts of the Proterozoic eon and Cambrian explosion caused an increase in biodiversity. Given the lemma "life will thrive in a comfortable environment" it should thrive more when the environment is better.