![]() ![]() 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. 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. The book begins by discussing Alvarez's research in the 1970s, before ever investigating the cause of the Cretaceous–Paleogene extinction event, when he was researching plate tectonics involving the Apennine Mountains with William "Bill" Lowrie. ![]() 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 resulted in the Cretaceous–Paleogene extinction event. ![]() rex and the Crater of Doom is a nonfiction book by professor Walter Alvarez that was published by Princeton University Press in 1997. ![]()
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