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Archaeology to refine Holocene subsidence rates along the Nile delta margin, Egypt

¹ Mediterranean Basin Program, E-207 National Museum of Natural History, Smithsonian Institution, Washington D.C. 20560

Archaeological material and sites in the northern Nile delta record rates of land subsidence that are higher than those derived from radiocarbon-dated subsurface sediments. Reassessment of subsidence-rate calculations reveals that previous subsidence measurements of 1-5 mm/yr for the delta are minimum rates, because sediment reworking can result in radiocarbon-dated core ages that are older than the ages of final burial. Integration of archaeological and geologic subsurface data is essential for accurate age determinations, differentiation of sub-sidence from sea-level rise, and more precise calculation of vertical earth movement. Application herein of archaeological data to geological problems helps to refine subsidence-rate measurements between the flexure zone (landward margin of the Holocene Nile delta depocenter) and the coast.

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