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4 days ago · Cretaceous. The Cretaceous ( IPA: / krɪˈteɪʃəs / krih-TAY-shəs) [2] is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic.
12 hours ago · During the Ediacaran period, around 580 million years ago, the first animals appeared, but were mostly soft-bodied jellyfish-like creatures, unlike any modern animals. These animals are relatively ...
1 day ago · The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or paleontological ...
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1 day ago · The Cretaceous–Paleogene ( K–Pg) extinction event, [a] also known as the Cretaceous–Tertiary (K–T) extinction, [b] was a sudden mass extinction of three-quarters of the plant and animal species on Earth, [2] [3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.
4 days ago · The remains of the first marine animal forests from the Ediacaran Period, about 565 million years ago, are revealing how early communities of animal life may have impacted the flow of water. This had knock-on effects on the distribution of nutrients in the deep ocean tens of millions of years before the first fish made an appearance.
4 days ago · Tyrannosaurus rex, ( Tyrannosaurus rex ), species of predatory dinosaurs that lived during the end of the Cretaceous Period (about 66 million years ago) known from fossils found in the United States and Canada dating to between about 80 million and 66 million years ago.
4 days ago · Using state-of-the-art computer simulations of fossils from the Ediacaran time period—approximately 565 million years ago—scientists discovered how these animals mixed the surrounding seawater.
