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• 1. Introduction; 2. Proxy systematics; 3. Methods; 4. Sample materials and post-depositional alterations; 5. Long-term I/Ca trends through Earth history; 6. Short-term ocean deoxygenation events; 7. Quaternary glacial-interglacial cycles; 8. Future prospects.

Select Guide Rating

• 1. Introduction; 2. Proxy systematics; 3. Methods; 4. Sample materials and post-depositional alterations; 5. Long-term I/Ca trends through Earth history; 6. Short-term ocean deoxygenation events; 7. Quaternary glacial-interglacial cycles; 8. Future prospects.

Select Guide Rating

• 1. Introduction; 2. Proxy systematics; 3. Methods; 4. Sample materials and post-depositional alterations; 5. Long-term I/Ca trends through Earth history; 6. Short-term ocean deoxygenation events; 7. Quaternary glacial-interglacial cycles; 8. Future prospects.