Causes of the last global deep-sea extinction from the analyses of foraminiferal tests

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I analysed the causes of the last global deep-sea extinction of the particular benthic foraminifera during the mid-Pleistocene Transition. On the basis of their internal test morphology, they were found to have weak phylogenic relationship among other benthic foraminifera that shows similar structure inside the test. Optically granular structure were found in the test of extinct foraminifera and suggested their deep infaunal microhabitat. The last global deep-sea extinction was implied that it might have occurred in associated with cooling deep-water and becoming more oxidised environments at deep-sea during the middle Pleistocene.