A lot has happened in that time. Earth formed and oxygen levels rose in the foundational years of the Precambrian. The productive Paleozoic era gave rise to hard-shelled organisms, vertebrates ...

What did the Late Paleozoic climate and CO₂ look like? Our reconstruction showed that for part of this era the Earth's atmosphere sustained relatively low CO₂ (about 330 parts per million or ...

3 min read During the Ordovician period, part of the Paleozoic era, a rich variety of marine ... For the most part the Earth's climate was warm and wet, with sea levels rising as much as 1,970 ...