During the Last Glacial Maximum (LGM, ~20,000 years ago), vast quantities of water were locked in continental ice sheets (Laurentide, Fennoscandian, etc.), causing global (eustatic) sea level to drop substantially below present levels — a figure well constrained by coral reef terraces, coastal sediment records, and oxygen isotope proxies.
Geological and geochemical evidence (drowned coral reef terraces, continental shelf sediment records, and marine oxygen isotope stratigraphy) consistently places global sea level during the LGM...
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