(09-07-2021, 06:38 PM)F2d5thCav Wrote:Quote:The research team analysed a total of 538 amber samples from well-known amber deposits worldwide, with the oldest samples being approximately 220 million years old and recovered from the Dolomites in Italy.
The team also compared fossil amber with modern resins to test the validity of the data.
The results of this comprehensive study suggest that atmospheric oxygen during most of the past 220 million years was considerably lower than today's 21 per cent.
"We suggest numbers between 10 and 15 per cent," said Tappert.
https://www.firstpost.com/tech/news-anal...41691.html
No idea if that would bother beasts or not. Yeah, lots more CO2 back then; the woke crowd would have been beside themselves with outrage!
Cheers
Yes I have been hearing the 15% studies too. There are also studies that say 30% 300 million years ago thus the super large insects. If it is true about the 15% figure then the dino's had very efficient lungs as the birds do today. I can see a big drop in oxygen after the impact 65mya and extinction due to fires and volcanic eruptions.