The K/T Dinosaur Extinction Event – ThoughtCo, The K-T Mass Extinction, K–T extinction | Overview & Facts | Britannica, K–T extinction, abbreviation of Cretaceous–Tertiary extinction, also called K–Pg extinction or Cretaceous–Paleogene extinction, a global 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.
2/28/2018 · The Cretaceous-Tertiary Extinction Event — or K/T Extinction Event, as it’s known in scientific shorthand — has spawned a variety of less-than-convincing theories. Up until a few decades ago, paleontologists, climatologists, and assorted cranks blamed everything from epidemic disease to lemming-like suicides to intervention by aliens.
The paleontological evidence from the K-T boundary is ambiguous. While many phenomena are well explained by an impact or a volcanic hypothesis, others are not. The fossils do provide us with real evidence about the K-T extinction events, instead of inferences from analogy or from computer models. The best-studied terrestrial sections across the K-T boundary are in North America.
The K-T Mass Extinction. Sixty-five million years ago, more than three-fourths of all plant and animal species living on Earth became extinct. This event is known as the K-T mass extinction because it occurred at the boundary between the Cretaceous (K) and Tertiary (T) time periods. The most famous group of animals to perish was the dinosaurs.
3/29/2019 · This is the richest K-T boundary site ever found, incorporating insects, fish, mammals, dinosaurs and plants living at the end of the Cretaceous, mixed with …
