Leg 165, Hole 1002C, Core 1H, Section 4, 40-115 cm
In this core, from the Cariaco Basin off Venezuela, scientists found a detailed record of climate change during the early Holocene (~8,000-10,000 years ago). The core shows that during this time there was a dramatic shift from thinly layered, dark, organic-rich sediments (indicating a warm climate with high biological productivity) to gray nonlayered sediments (indicating a cooler climate with low biological productivity). These changes correlate with climate changes indicated in Greenland ice cores for the same time period, leading to the important discovery that tropical regions of the Earth play a significant role in global climate change.
Download a photo of the core. (JPG, 967 KB)
See http://www-odp.tamu.edu/publications/leg_ndx/165ndex.htm for more detailed information about Leg 165.