The enigma of Oligocene climate and global surface temperature evolution

The enigma of Oligocene climate and global surface temperature evolution [Earth, Atmospheric, and Planetary Sciences]:

Falling atmospheric CO2 levels led to cooling through the Eocene and the expansion of Antarctic ice sheets close to their modern size near the beginning of the Oligocene, a period of poorly documented climate. Here, we present a record of climate evolution across the entire Oligocene (33.9 to 23.0 Ma)...