The Earth was already more than 600 million years ... is not unlike one of the first life forms that appeared in the Precambrian era. Photograph by Joel Sartore, National Geographic Photo Ark ...

the supercontinents of Gondwana 2 and Nuna (Columbia), as well as the geology of the Precambrian era. Earth scientists in the department also closely monitor global issues, such as energy security.

The Precambrian encompasses 86 percent of the history of Earth. As its name implies, this includes all of geological time prior to the Cambrian period. Hadean Era (4,550-3,850 mya) The Precambrian ...

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 ...

A fascinating fossil discovery in remote South Australia sheds light on an important chapter in the history of life on Earth ... they existed during the Precambrian period. In a recent study ...