Cretaceous–Paleogene extinction event

1 week ago - The Cretaceous–Paleogene (K–Pg) extinction event, formerly known as the Cretaceous-Tertiary (K–T) extinction event, was a major mass extinction of three-quarters of the plant and animal species on Earth approximately 66 million years ago. The event caused the extinction of all non-avian ...

The Cretaceous-Paleogene (K-Pg) mass extinction eradicated 76% of species on Earth1,2. It was caused by the impact of an asteroid3,4 on the Yucatán carbonate platform in the southern Gulf of Mexico at 66.0 Ma5 which formed the Chicxulub impact crater6,7.

April 14, 2009 - K–T extinction, a global mass extinction event responsible for eliminating approximately 80 percent of all species of animals at or very close to the boundary between the Cretaceous and Paleogene periods, about 66 million years ago.

Sixty-five million years ago about 70% of all species then living on Earth disappeared within a very short period. The disappearances included the last of the great dinosaurs. Paleontologists speculated and theorized for many years about what could have caused this "mass extinction," known, ...

The extinction that occurred 65 million years ago wiped out some 50 percent of plants and animals. The event is so striking that it signals a major turning point in Earth's history, marking the end of the geologic period known as the Cretaceous ...

While the first two seem to have generated some level of extinction, it is the impact that seems to be the primary driver of this extinction. •Survivorship on land seems to be controlled mostly by favoring small body size and ability to feed from stored food resources; in the sea it is the latter which is the most important factor. •The western North American (Laramidian) fossil record of the last 15 million years of the Cretaceous is the most complete in the run up to the extinction event; there are some losses of groups before the impact that seem to have been driven by other environmental factor.

May 13, 2025 - The K-T Extinction divides the ... live in. The K-T Extinction happened around 65 million years ago, taking out an estimated 75% of all living species on Earth at the time....

September 1, 2022 - Dinosaurs were not the only victims of the extinction. More than 60 percent of species perished globally. In the oceans, entire genera of invertebrates died out. On land, gymnosperms and angiosperms, groups that include most modern trees, barely ...

November 3, 2022 - The Cretaceous–Paleogene (K–Pg) extinction event, also known as the Cretaceous–Tertiary (K–T) extinction,[lower-alpha 2] was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million ...

The Cretaceous extinction wiped out about 65% of all species.

— Sixty-six million years ago, an asteroid the size of San Francisco crashed into a shallow sea off the coast of modern-day Mexico and plunged the world into an extinction event that killed off as much as 75% of life, including the dinosaurs.

May 3, 2021 - Though mass extinctions are deadly events, they open up the planet for new forms of life to emerge. The most studied mass extinction, which marked the boundary between the Cretaceous and Paleogene periods about 66 million years ago, killed off the nonavian dinosaurs and made room for mammals ...

December 10, 2012 - Species-level extinction was 83%, and the K-Pg event resulted in the elimination of many lizard groups and a dramatic decrease in morphological disparity. Survival was associated with small body size and perhaps large geographic range.

3 weeks ago - About 17% of all families, 50% of all genera and 75% of all species became extinct. In the seas all the ammonites, plesiosaurs, and mosasaurs disappeared and the percentage of sessile animals was reduced to about 33%. All known non-avian dinosaurs ...

Approximately 80 percent of all species of animals across the globe were rendered extinct. Losses included many lines of animals that had been important elements of the Mesozoic Era.

The effects of the Cretaceous-Tertiary (K/T) boundary global change on calcareous nannoplankton and planktic foraminifera are most severe in low latitudes and negligible in high latitudes. In low latitudes, species extinctions are complex and prolonged beginning during the final 100,000 to 300,000 yr of the Cretaceous, accelerating across the K/T boundary, and reaching maximum negative conditions between 10,000 and 40,000 yr into the Tertiary accompanied by low primary productivity.

But many groups of organisms, such as flowering plants, gastropods and pelecypods (snails and clams), amphibians, lizards and snakes, crocodilians, and mammals "sailed through" the Cretaceous-Tertiary boundary, with few or no apparent extinctions at all.

2 weeks ago - At the end of the Cretaceous, the impact of a large body with the Earth may have been the punctuation mark at the end of a progressive decline in biodiversity during the Maastrichtian age. The result was the extinction of three-quarters of Earth's ...

No great extinction or burst of diversity separated the Cretaceous from the Jurassic Period that had preceded it. In some ways, things went on as they had. Dinosaurs both great and small moved through forests of ferns, cycads, and conifers. Ammonites, belemnites, other molluscs, and fish were ...

3 weeks ago - The Cretaceous-Paleogene extinction event (abbreviated as the K-Pg extinction event) was the last and most famous mass extinction. It was caused by a large asteroid that struck the Earth in what is now the Yucatán Peninsula, igniting a series of events that led to the extinction of all non-avian dinosaurs, pterosaurs, large marine reptiles, and countless other species.