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Related Experiment Video

Updated: Jul 12, 2026

Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass

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Arctic oceanic climate in late cenozoic time.

Y Herman, D M Hopkins

Science (New York, N.Y.)

|August 1, 1980

Summary

Paleoceanographic events over the last 4.5 million years were reconstructed using faunal and lithologic evidence. Perennial sea-ice cover began approximately 0.7 million years ago.

Area of Science:

Paleoceanography
Marine Geology
Paleoclimatology

Background:

Understanding past oceanographic conditions is crucial for predicting future climate change.
Reconstructing long-term oceanic and climatic shifts provides context for current environmental trends.

Purpose of the Study:

To reconstruct paleoceanographic events over the last 4.5 million years.
To determine the timing of key paleoceanographic shifts, such as the onset of perennial sea-ice cover.

Main Methods:

Analysis of faunal assemblages to infer past marine conditions.
Examination of lithologic evidence (e.g., sediment composition) to reconstruct environmental changes.

Main Results:

Detailed reconstruction of paleoceanographic events spanning the last 4.5 million years.

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Dating the inception of perennial sea-ice cover to approximately 0.7 million years ago.

Conclusions:

Faunal and lithologic data provide robust proxies for reconstructing past ocean environments.
The onset of perennial sea-ice cover around 0.7 million years ago represents a significant paleoceanographic event with potential implications for global climate.