One shot in a million, and they find it by accident. Wild.
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A small but significant find made during a geological survey provides evidence of the oldest human presence yet discovered along the northernmost margin of Egypt's Nile delta.....This long, thin object, formed of dolomite,(a stone tool) ...fortuitous find documents an early human presence in the mid-Holocene wetlands along the delta's paleocoast, a sector where traditional excavation and augering are normally incapable of reaching zones of ancient human activity now at considerable subsurface depths.
Radiocarbon analysis of plant-rich matter in the mud surrounding the object provides a date of 3350 to 3020 B.C., the late Predynastic period....The fragile object lay buried at a depth of 7.5 meters in dark mud deposited in a brackish lagoon setting close to a marsh.