were among the most successful organisms ever to populate Earth. These familiar marine arthropods first arose about 545 million years ago in the early Cambrian and thrived throughout the world's ...
If the formations are fossils, then they appear to date back to ... of complex life on Earth appear to have had circumstances similar to when life bloomed in the Cambrian period, 635 million ...
the Earth's rotation has been decelerating, but the rate of this deceleration over time has never been established. They analyzed eight sets of data on rock layers from marine habitats that date ...
All animal evolution for the last half billion years has come from tinkering with these Cambrian body plans. Then, between about 570 and 530 million years ago, another burst of diversification ...
dramatically. It was the time of the Cambrian Explosion, an eruption of life when Earth’s very first animals began appearing in the fossil record — the ancestors of all major animal groups ...
"This was a fascinating time in Earth's history," said Kalin McDannell, a postdoctoral researcher and the lead author of the paper. "The Great Unconformity sets the stage for the Cambrian ...
The International Geological Correlation Programme started Project 156, on world phosphate resources, in 1977. An international team of forty-six researchers describes in twenty-five chapters almost ...
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