Triassic Mass Extinction
The mass extinction during the Permian-Triassic period happened nearly 251.4 million years ago that literally made the border line between Permian and Triassic geologic periods. This extinction has been recorded as the most relentless extinction in which nearly ninety-six percent of the oceanic genus and seventy percent of terrestrial vertebrate died out, and majority of the insects disappeared. |
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Almost 57 percent from the every species and 83 percent of all the classes became extinct. This is also known as the 'mother of all mass extinction' after which it took a long time to get back the normal ecological balance.
Studies and researches suggested that this extinction happened gradually and in different phases. In the first phase, slowly and steadily environment changes took place. Also, the period saw severe volcanic eruptions. It took a long to overcome this. The fungi and spores went on growing fast, while coral reefs and coal beds took million of years. Marine population was also disturbed and dasyclad algae and calcareous sponges did not resurface till million of years. The bivalves and gastropods of the shelly benthic species were present, but they grew in abundance only after a long duration of ten million years. The brachiopod, which was once considered as the most dominant species in the period, had almost vanished.
The land animal Lystrosaurus governed and the first dinosaur appeared that made the amphibians and mammals look very small in size. Conifers and ginkgos were found to be in Lazarus species.
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