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 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 ...

Paleontologists now know that the Precambrian actually did swarm with ... Any sedimentary rocks that formed before life appeared on Earth would have the high C-13 ratio of a volcanic origin.

A fundamental Precambrian–Phanerozoic shift in Earth’s glacial style ... Low-latitude glaciations in the Paleoproterozoic era. Nature 386, 262–266 (1997). Farquhar, J., ...

What era is formation of Earth's atmosphere? In the six billion year period ago Earth cooled, and gases ejected from volcanoes created an atmosphere. The atmosphere at that time, however, contained ...

The Royal Tyrrell Museum has a new exhibit that explores fossils from the Precambrian ... in the Cambrian era about 500 million years ago, when the surface of the Earth cooled down, oceans began ...

Still recovering from the intense volcanic activity that triggered the era, Earth’s oceans were warm in the aftermath of the end-Permian extinction and oxygen-drained. In fact, in addition to the ...

Australian researchers have uncovered evidence of a massive impact crater that could revolutionise our understanding of Earth's geological ... (Massive Australian Precambrian-Cambrian Impact ...