The Cretaceous-Paleogene (K-Pg) period, formerly known as the Cretaceous-Tertiary (K-T) period, is a geological period that spans from approximately 145 million years ago to 66 million years ago. This period is known for the mass extinction event that marked the end of the Mesozoic Era and the beginning of the Cenozoic Era.

Key Events

Mass Extinction: The K-Pg boundary is marked by a mass extinction event that led to the demise of the dinosaurs and many other species.
Impact Event: It is widely believed that a large asteroid impact, such as the Chicxulub impact, played a significant role in the mass extinction event.
Climate Change: The K-Pg period saw significant changes in global climate, including sea level fluctuations and temperature variations.

Study Guide

1. What is the Cretaceous-Paleogene period?

The Cretaceous-Paleogene period is a geological period that spans from approximately 145 million years ago to 66 million years ago. It is known for the mass extinction event that marked the end of the Mesozoic Era.

2. What are the key events associated with the K-Pg period?

The key events include the mass extinction, impact event, and significant climate change.

3. What is the significance of the K-Pg boundary?

The K-Pg boundary marks a major shift in Earth's history, leading to the extinction of the dinosaurs and numerous other species, and the beginning of the Cenozoic Era.