Story: Sea floor geology

Sediment cores

Sediment cores

A sediment core is a cylindrical sample of material from the seabed. Corers can penetrate 50 metres or more. Because deeper sediment is older, geologists can study past events by looking at the different layers. This 9.7-metre core was taken 670 kilometres east of the North Island, from waters 4 kilometres deep. The upper part is at top left, and the bottom is halfway down column 7. The light grey areas contain fossilised plankton, and indicate changes in the ocean over thousands of years. The darker layers are ash deposits erupted from volcanoes in the Taupō region.

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NIWA – National Institute of Water and Atmospheric Research

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How to cite this page:

Keith Lewis, Scott D. Nodder and Lionel Carter, 'Sea floor geology - Exploring the sea bed', Te Ara - the Encyclopedia of New Zealand, (accessed 20 July 2024)

Story by Keith Lewis, Scott D. Nodder and Lionel Carter, published 12 Jun 2006