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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 54 (1970)

Issue: 3. (March)

First Page: 558

Last Page: 559

Title: Pleistocene-Holocene Boundary in Southwestern Indian Ocean: ABSTRACT

Author(s): Edith Vincent

Article Type: Meeting abstract


The Pleistocene-Holocene boundary has been determined in deep-sea cores from the southern Mozambique Channel area of the Indian Ocean. The boundary, dated by radiocarbon at approximately 10,000 years B.P., is defined by changes in the relative abundance of planktonic Foraminifera. These changes reflect a warming in the Holocene of a few degrees Celsius. The temperate species Globorotalia inflata (d'Orbigny) shows a marked decrease in relative abundance in the Holocene; it comprises about 20% of the planktonic foraminiferal population below the boundary and only 3% or less above. Simultaneously,

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the percentage of warmer water species shows an increase in the Holocene. Neogloboquadrina dutertrei (d'Orbigny) increases from about 5% of the population below the boundary to about 15-20% above, and Pulleniatina obliquiloculata (Parker and Jones) increases from less than 1% to 10%.

There is a significant increase in the radiolarian number in sediments of the Holocene.

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