Our reconstruction showed that for part of this era the Earth's atmosphere sustained ... as demonstrated during the Late Paleozoic, precise knowledge of past levels and changes is fundamental ...

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 ...

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 ...