🧂 How the Mediterranean dried up and refilled

What you’ll learn

1. When the sea lost its oceanExplain how a narrowing Atlantic gateway and an arid water budget together set off the Messinian Salinity Crisis.The Mediterranean loses more water to evaporation than rain and rivers return. When tectonics closed its Atlantic corridors between 5.97 and 5.33 million years ago, salt began to accumulate across the basin.
2. Reading a basin that driedRead evaporites, buried canyons and layer order as evidence, and state honestly what is still contested about how far the sea fell.Sorbas gypsum comes in precession-driven cycles rather than one long drought, and the amplitude of the Mediterranean drawdown — 600 metres or 1,800 — is still an open argument.
3. The flood finds a doorwayDescribe the Zanclean megaflood hypothesis and distinguish its modelled two-year estimate from an observation.A breach at Gibraltar could amplify through its own erosion, moving ninety per cent of the water in months to two years before the flow crossed the Sicily sill into the eastern basin.
4. What the refill changedSeparate the speed of physical refilling from the far longer chemical and sedimentary aftermath.The returning sea restored marine conditions in the west quickly, but the east stayed hyper-stratified for roughly 26,000 years, and a kilometre of salt is still buried beneath the floor.

Questions this course answers

Grounded in trusted sources

• García-Castellanos, D., Estrada, F., Jiménez-Munt, I., Gorini, C., Fernàndez, M., Vergés, J. & De Vicente, R., “Catastrophic flood of the Mediterranean after the Messinian salinity crisis”, Nature 462, 778–781 (2009) — doi:10.1038/nature08555
• García-Castellanos, D., Micallef, A., Estrada, F., Camerlenghi, A., Ercilla, G., Periáñez, R. & Abril, J., “The Zanclean megaflood of the Mediterranean — searching for independent evidence”, Earth-Science Reviews 201, 103061 (2020) — doi:10.1016/j.earscirev.2019.103061
• Micallef, A., Camerlenghi, A., García-Castellanos, D. et al., “Evidence of the Zanclean megaflood in the eastern Mediterranean Basin”, Scientific Reports 8, 1078 (2018) — doi:10.1038/s41598-018-19446-3
• Amarathunga, U., Hogg, A. McC., Rohling, E. J., Roberts, A. P. et al., “Sill-controlled salinity contrasts followed post-Messinian flooding of the Mediterranean”, Nature Geoscience 15, 720–725 (2022) — doi:10.1038/s41561-022-00998-z
• Gvirtzman, Z., Heida, H., García-Castellanos, D., Bar, O., Zucker, E. & Enzel, Y., “Limited Mediterranean sea-level drop during the Messinian salinity crisis inferred from the buried Nile canyon”, Communications Earth & Environment 3, 216 (2022) — doi:10.1038/s43247-022-00540-4
• Bosworth, W. & Mitchell, N. C., “Deep drawdown of the Mediterranean during the Messinian Salinity Crisis inferred from Nile Canyon 3D seismic reflection data near Cairo, Egypt”, Palaeogeography, Palaeoclimatology, Palaeoecology 690, 113680 (2026) — doi:10.1016/j.palaeo.2026.113680
• Manzi, V., Gennari, R., Hilgen, F., Krijgsman, W., Lugli, S., Roveri, M. & Sierro, F. J., “Age refinement of the Messinian salinity crisis onset in the Mediterranean”, Terra Nova 25, 315–322 (2013) — doi:10.1111/ter.12038
• Evans, N. P., Turchyn, A. V., Gázquez, F., Bontognali, T. R. R., Chapman, H. J. & Hodell, D. A., “Coupled measurements of δ18O and δD of hydration water and salinity of fluid inclusions in gypsum from the Messinian Yesares Member, Sorbas Basin (SE Spain)”, Earth and Planetary Science Letters 430, 499–510 (2015) — doi:10.1016/j.epsl.2015.07.071

Every Wunder lesson is built from real, reputable sources — never invented.

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