The transition in and out of the Late Paleozoic ice age was one of the biggest climate transitions in Earth's history, a ...

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 ...

Locations of individual study areas are described in the text. After Keppie (2000). The Appalachian orogen of North America is divisible with some controversy into five tectonolithologic zones which ...

What If is a Webby Award-winning science web series that takes you on a journey through hypothetical worlds and possibilities, some in distant corners of the universe, others right here on Earth.

Geologic Time is a crucial concept to understanding the history of the earth—including the evolution of life ... The largest extinction events define a change in era. The end of the Paleozoic and ...

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 ...