The Final Hours: The End of the Age of Dinosaurs

This course examines the final days of the Cretaceous period, beginning with an analysis of the complex ecosystems that existed before the Chicxulub impact. It investigates the stability of dinosaur populations and the environmental conditions of the Hell Creek formation to explain why these species were successful prior to their sudden extinction. The curriculum covers the specific physics of the ten-kilometer-wide asteroid strike, including the conversion of kinetic energy into thermal radiation and the immediate formation of a hundred-mile-wide crater. You will learn about the geological evidence of the event, such as the Tanis site and the presence of tektites, which document the massive seismic activity and megatsunamis that reshaped the planet's geography in the hours following the collision. The series also explores the cascading environmental failures caused by the ejecta layer and subsequent global firestorms. It details how the injection of billions of tons of sulfur and soot into the stratosphere triggered a prolonged impact winter, blocking sunlight and halting photosynthesis. This process resulted in the collapse of the global food web, leading to the extinction of non-avian dinosaurs and large marine reptiles. Finally, the course identifies the survival traits that allowed specific lineages to endure, such as small body size and generalized diets. By studying the recovery phase and the arrival of the fern spike, we trace how this catastrophe cleared the ecological vacuum necessary for the rise of mammals and the eventual development of modern life.