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Another data point from about the same period

The Burckle impact crater in the Indian Ocean created gigantic tsunami waves , that pushed megatons of seafloor up onto Madagascar that left chevron dunes in their wake. The vaporized ocean probably made it rain for weeks far away from the crater. Anyone close to the Indian Ocean would have been killed, and many people would have perished in the weather that followed the impact.

IMPACT CRATERS AS SOURCES OF MEGATSUNAMI GENERATED CHEVRON DUNES

Chevron dunes are not formed by wind. Chevron dunes are not oriented in the direction of the prevailing wind, they can form where there are no beaches, and they contain grains larger than 2 mm in diameter. Chevrons are produced by megatsunamis originating from point sources, i.e. landslides, impact craters, and volcanic explosions. We have assembled data on chevrons worldwide. Most are best explained as the result of tsunami generated from large impact cratering events. We now have data confirming an impact origin of two chevron sources. In the Indian ocean, chevron dunes in Western Australia, India, and Madagascar point towards the 29 km Burckle Crater at 30.865S, 61.365E. The impact ejecta from Burckle crater contain meteorite fragments, impact glass, oceanic mantle fragments, and impact spherules. The impact spherules are >200 microns in diameter, consistent with a 29 km crater. The impact glasses have no K and cannot be continental in origin. In the Gulf of Carpentaria, we found impact ejecta that contain impact glass and meteoritic material: merrillite, high Ni metal, and probable melted carbonaceous chondrite [1]. We also found abundant magnetite impact spherules with a bimodal size distribution [2]. This implies two source craters for the chevrons: the 18 km Kanmare (Serpent) crater at 16.58S, 139.057E and the 12 km Tabban (Rainbow) crater at 17.125S, 139.86E. In the Mediterranean, a megatsunami source near the Rhone delta is of undetermined origin. All other sources are impact crater candidates and require more study. We found the following: the 1 km Judge crater candidate in Long Island Sound at 41.17N, 72.405W, the 10 km Quetzalcoatl crater candidate in the Caribbean at 22.04N, 96.32W, the 18 km Grendel crater candidate in the North Sea at 58.16 N, 5.86E, the 5 km Kangaroo crater candidate at 39.0465S, 141.285E and the 4 km Joey crater candidate at 39.16S, 141.21E.

Burckle Abyssal Impact Crater: Did this Impact Produce a Global Deluge?

We have found an impact crater that is likely < 6000 years old. Burckle Crater is in the central Indian Ocean at 30.87° S 61.36°E. The crater is 31±1 km wide. The crater is deepest SE of its center. There is a deep gouge in the surface topography to the SE and a topographically smooth area NW of the crater rim. These topographic features suggest that the impactor came from the SE and that the tektite field lies NW of the crater rim. We are looking for tektites in young abyssal sediments from NW of the crater. Because the impactor hit a fracture zone wall, the rim of Burckle crater is unusually well defined. The crater rim shows evenly spaced notches that we interpret as resurge gullies. Near Burckle crater, we found a 26 cm thick layer with high magnetic susceptibility that extends to the top of core DODO132P. DODO132P has a basal age of Pleistocene. The high susceptibility layer contains numerous Mn oxide coated rock fragments, as expected for an ejecta layer from an impact that fragmented a fracture zone wall. These fragments do not resemble typical Mn nodules. We also found clear fragments of mid-ocean ridge type plagioclase and a grain of NiC with a metallic luster. The NiC is clearly a fragment of the impactor as it has an ablation rind of oxidized NiC that forms drops on the surface of the grain. The NiC contains no significant Fe and we interpret it as a piece of a comet. Burckle crater impact event is in the right location to be the source of devastating rains, tsunamis, winds, and associated social upheaval around 2807 B.C.

It would have been about 6000 years ago.