Cretaceous Paleogene Extinction Event History essay
The Hell Creek Formation spanned the Cretaceous and Paleogene periods, and paleontologists had known for at least half a century that an extinction had occurred then, because dinosaurs were too. The Cretaceous-Paleogene K-Pg boundary represents one of the five largest mass extinction events in Earth's history and is also associated with major changes in the global environment D Hondt, 2005. The history of life on Earth is marked five times by events of mass biodiversity extinction caused by extreme natural phenomena. Today, many experts warn of a sixth mass extinction crisis. Scientists have debated until now what caused Earth's oceans to become so inhospitable to life that one percent of marine species became extinct by the end of the Permian Era. New research shows that the Great Dying was caused by global warming, which left ocean animals unable to breathe. The Chicxulub impact is widely considered to be the primary driving force behind the Cretaceous-Paleogene KPg mass,2 which has multiple long-lasting, planet-wide consequences for life on Earth. A. The effect of the Cretaceous-Paleogene K-Pg, formerly Cretaceous-Tertiary, KT mass extinction on bird evolution is debated, mainly due to the poor fossil record of Late Cretaceous birds. In particular, it remains unclear whether archaic birds gradually became extinct over the course of the Cretaceous, or whether the Cretaceous-Paleogene K-Pg mass extinction caused by an asteroid impact on the Yucat n platform in the southern Gulf of the most recent and fastest of the five. Dinosaurs met their demise during the Cretaceous-Paleogene extinction event one million years ago, believed to be caused by a colossal meteor. The Cretaceous period is known for the K-Pg extinction. This event took place a million years ago. During this time, many invertebrates and large vertebrates became extinct. This biological, geological and climatic event had consequences. Below are the most important events of this period. That is, a catastrophic meteorite impact one million years ago caused a global mass extinction, forever changing life on Earth, including the extinction of the dinosaurs. This. 1. Introduction1.1. Global K-Pg climate and environmental change. The K-Pg boundary is well defined in the form of a sharp clay layer in both marine and non-marine sequences, and this level corresponds to the main extinction event at the end of the Cretaceous. Schulte et al. 2010. The Chicxulub asteroid impact that struck Yucatan,