Ancient sea level shifts reshaped the landscapes of California's Channel Islands
In short: Researchers reconstructing the history of California's Northern Channel Islands found that sea levels were significantly different during the first human arrivals. By accounting for regional geological shifts, the team determined that the coastline was roughly 80 to 85 meters lower than it is today during the late Pleistocene.
This research is vital because rising oceans have submerged much of the archaeological record, making it difficult to understand how early humans interacted with their environment. The study used models to adjust for glacial isostatic adjustment—the way the earth's crust moves in response to melting ice—to create a more precise map of the past. However, the study relies on modeling rather than direct physical excavation of the submerged sites.
Why it matters: Understanding ancient shorelines helps reveal how changing environments shaped the lives and resources of early human societies.
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Sources
- Summary by Intellect · source: Research: Myers et al. (2015). Sea level, paleogeography, and archeology on California's Northern Channel islands. Quaternary Research.
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