Weisler coral dating 19th century iron key dating

Earth’s climate has undergone many changes over the course of geologic history, but the past one million years or so have been among the most dynamic.During that time, the planet has experienced repeated cycles of glacial (cold) and interglacial (warm) periods lasting about 80,000 years on average.

The sheer weight of the ice at the height of the last ice age depressed Earth’s crust to such an extent that many areas are still slowly but noticeably rebounding to this day, 18,000 years after the retreat of the glaciers.[ MORE ]The formation of the ice also removed so much water from the global ocean that sea levels during ice ages were notably lower than interglacial periods such as the present day—as much as 400 feet lower during some periods.

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However, future research should examine the archipelago-wide spatial variability in ΔR with the analysis of additional dated archaeological coral samples.

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