T. rex and the Crater of Doom | Princeton University PressWith an OverDrive account, you can save your favorite libraries for at-a-glance information about availability. Find out more about OverDrive accounts. Sixty-five million years ago, a comet or asteroid larger than Mount Everest slammed into the Earth, inducing an explosion equivalent to the detonation of a hundred million hydrogen bombs. Vaporized detritus blasted through the atmosphere upon impact, falling back to Earth around the globe. Disastrous environmental consequences ensued: A giant tsunami, continent-scale wildfires, darkness, and cold, followed by sweltering greenhouse heat. When conditions returned to normal, half the plant and animal genera on Earth had perished.
cbm11.org and the Crater of Doom-Walter Alvarez trailer
T. Rex and the Crater of Doom
The book discusses the research and evidence that led to the creation of the Alvarez hypothesis , which explains how an impact event was the main cause that led to the Cretaceous—Paleogene extinction event. The book begins by discussing Alvarez's research in the s. The method of this research was to use the evidence of the Earth's magnetic field to show that the plate upon which the rocks of the mountains rested had rotated over millions of years. While investigating limestone deposits in Gubbio , they discovered that some of the rocks were not aligned with the magnetic north pole , but in the opposite direction, implying the Earth undergoes geomagnetic reversal over time. This, with the plentiful fossilized material of extinct foraminifera , allowed them to date the time differences between each reversal and catalog the species of microscopic life found in each era. In doing so, they discovered that a certain time period had resulted in very few foraminifera fossils being formed, a boundary of little life now known as the Cretaceous—Paleogene boundary or the KT boundary. Just above this boundary, there was a thick layer that had no evidence of fossils at all, pointing to an almost complete extinction of microscopic sea life.
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