T rex and the crater of doom pdf

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t rex and the crater of doom pdf

T. rex and the Crater of Doom | Princeton University Press

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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.

Working from the s to the early s, Walter Alvarez and his research teamsought the cause of the mass extinction that claimed the dinosaurs 65 million years ago. The present paper discusses thatresearch in terms of eight puzzling observations, eight episodes of hypothetico-predictive reasoning, enumerative induction,and Jung's interrogative theory of scientific discovery. The Alvarez case history paints scientific discovery as a process in whichcausal questions are raised and answered through the creative use of analogical reasoning followed by an equally creative process ofhypothesis testing in which predicted and observed results are compared. According to this account, puzzling observations, causalhypotheses, and imagined tests drive investigations and the search for evidence. Two implications follow. The firstconcerns the education of new scientists and science education researchers and the need to more clearlydifferentiate hypotheses from predictions in the research process.

Editorial Reviews. moriggl.info Review. One of the great mysteries is what happened to the dinosaurs, and it has taken great detective work to give us an.
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