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Deep-sea sediment core

  • Exhibition Text

    • This marine sediment core from the tropics shows fine laminations of alternating light and dark layers. These indicate seasonal changes in biological activity in the waters from which the sediments were deposited. Light layers, formed during winter, are richer in biologically produced carbonate, while dark layers, formed during summer, contain fewer biologically produced sediments and more silts and clays. The nearly 3,000 years spanned by this core includes the onset of the Younger Dryas, a cold period marked in the core by a general lightening of sediment color, the direct result of in-creased biological productivity.

      Loaned by the Ocean Drilling Program

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  • For Educators

    • Topic: Earth Science

      Subtopic: Oceans

      Audience: General

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