It has long been assumed that the mass extinction of dinosaurs — a difficult geological problem – occurred as a result of the impact of a massive stone on the earth, as proposed by the Alvarez father and son team in 1980. Despite these objections, Alvarez and Alvarez's viewpoint has received widespread acceptance from geologists, including palaeontologists and other fields of science.
The author gives a significantly different perspective on dinosaur extinction, for which it is thought necessary to understand the causes of massive animal expansion. It can be presumed from the massive coal deposits of the Permian and Carboniferous periods that the oxygen content of the atmosphere of the Triassic period - which followed - increased greatly due to widespread photosynthesis of glossopteris-rich forests. From this perspective, the favourable oxygen-rich environment with lots of food material that prevailed during the Triassic epoch could be a plausible reason for some creatures' rapid growth. As a result, animals that roamed in the oxygen-rich atmosphere of the time, where lots of food was also available, grew to be big. However, during the K-T boundary stage, when major volcanism occurred in numerous parts of the globe, the oxygen concentration of the atmosphere was significantly reduced, a completely different condition prevailed. This resulted in the extinction of huge species that required a greater amount of oxygen for survival, whereas smaller animals were untouched.Author(S) Details
Subhasis Sen
Council of Scientific and Industrial Research, India.
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