Cretaceous–Tertiary extinction event

The Cretaceous-Tertiary extinction or K-T extinction, which marks the Late Cretaceous, is a massive and large-scale extinction of animal and plant species that occurred over a short period of time 66 million years ago. The fossils of non-avian dinosaurs (the Group of birds) found almost only below the K-T boundary, paleontologists mostly estimate that the dinosaurs were extinguished just before, or during the event. Scientific theories explain the extinctions of K-T by one or more catastrophic events

The cretaceous-tertiary (KT) boundary extinction happened approximately sixty five million years ago. Sixty to eighty percent of all living species became extinct at this boundary (Raup 1988). The KT extinction was indeed a mass extinction event. Mass extinctions are periods in Earth's history when extremely large numbers of species die out simultaneously or within a limited time frame. The most severe mass extinction ever occurred at the end of the Permian period when 96% of all species died out

Intro to question: Their extinction occurred at the end of the Cretaceous period and is noted as one of the largest mass extinctions in Earth's history and is referred to as the K-T (Cretaceous Tertiary) extinction but is now called the Cretaceous Paleogene (K-Pg) event by many researchers. So from this information a question has been derived, How effectively does the asteroid theory explain the extinction of dinosaurs compared to other theories? A wide variety of extinction theories have been suggested

The fifth, and one of the largest and most well known extinctions in Earths history was the Cretaceous period, where many species, including the dinosaurs, pterosaurs, and large marine reptiles, disappeared. This period was widely known as the K-T period, K being the traditional abbreviation for the Cretaceous Period derived from the German name Kreidezeit, and T being the abbreviation for the Tertiary Period (a historical term for the period of time now covered by the Paleogene and Neogene periods)

The Triassic-Jurassic extinction occurred about 210 million years ago, killing about 80 percent of all living species (“End-Triassic Extinction”). Most species were hit hard, but there were no major full-on extinctions. Still, cephalopods, sponges, corals, reptiles, and pollen and spore producing plants were hit hard. The dinosaurs, however, were lucky and survived the extinction intact. This allowed them to reign supreme for the next geological epoch (“End-Triassic Extinction”). During the time of

from their Archosaurs ancestors during the middle to late Triassic period. For 160 million years they have dominated our planet. They are dubbed the most successful species to have lived on Earth. However, 65 million years ago, the most recent mass extinction seemed to have caused all of them to die-off. What caused the demise of the dinosaurs and 60% of life on Earth at the time? How did it affect life on Earth afterwards? Are all of the Dinosaurs dead? Will this happen to humans in the near future

hypotheses put forward for the mass extinctions at the end of the Permian and Cretaceous (KT) Periods. A mass extinction is an event in which at least 25-75% of species in the global environment are eradicated in a short period of time. Where as a regional extinction event is when the extinction is confined to a specific zone. Five mass extinctions have occurred throughout time, two of the most well known of these are the Permian and Cretaceous extinction events. There are several hypotheses

years ago a mass extinction of the dinosaurs took place marking the end of the Cretaceous Period when dinosaurs lived and the beginning of the Tertiary Period when no dinosaurs remained (“Dinosaurs”). This period is also known as the Cretaceous/Tertiary, or K/T Boundary (“Dinosaurs”). Just what caused the mass extinction is still up for debate but the two main theories are either an impact from a huge asteroid or massive strain if

BIOL2110- Vertebrate Zoology Word count: 1056 Dinosaur extinction: An analysis of events and theories that possibly led to the dinosaurs' demise. Ever since the history of Earth has been studied using fossil records, extinctions have always been the object of fascination and interest, particularly the mass extinctions that occurred throughout Earth's history. A mass extinction can be caused by disruptive global environmental changes, where large numbers of species have become extinct (Urry

Extinction of Dinosaurs due to Asteroid Impact Nobody knows for sure exactly how the dinosaurs became extinct. However scientists have speculated for decades about possible events that caused the dinosaurs to die out. Possibilities range from asteroids, to volcanoes, to climate changes. One of the more popular or well-known extinction theories involves the belief that an asteroid struck the Earth, causing devastating effects, and triggering mass extinctions around the end of the Cretaceous