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 on the edge of a fracture zone at 30.87° S 61.36°E. The crater is 29±1 km wide and is the inferred source of layers with high magnetic susceptibility in 3 deep sea cores. Each layer goes to the top of the core. Two out of 3 of the cores have basal Pleistocene ages and the basal age of the third is unknown. The high susceptibility layers contain broken plagioclase, spinel periodotite, and chrysotile asbestos. One sample contains pure Ni with drops of oxidized Ni. Because pure Ni melts at 1453°C, it is very likely that the drops formed during an impact. The high susceptibility layers from 2 cores are over 5 times thicker than they should be for a 29 km wide source crater. We also find that a 29 km wide source crater cannot vaporize enough seawater to produce meters of rain, even in a restricted region between 4750 and 7250 km from the crater. Thus, we infer that Burckle crater was produced as part of a Shoemaker-Levy type impact of a comet. The fragmented comet also produced two other large impact centers, one in the northwest Pacific and another in the central eastern Pacific. Where the rainout from these impact centers overlaps, we see deluge events that are over a week long. The impact event also produced devastating tsunamis, winds, and associated social upheaval. We date the event to around 2807 B.C

Exotic Grains in a Core from Cornwall, NY - Do They Have an Impact Source?

We have found seven discrete layers in a bog core from Cornwall, NY about 80 km away from the Atlantic Ocean. All but two layers contain material that is unlikely to be locally derived. In most cases, the material in the layers has been transported thousands of kilometers from its source area. Six out of the seven layers are difficult to explain except through impact processes. If all of these layers are derived from impacts that produced craters, the data imply a very high impact rate during late Holocene time. In addition, we have been able to associate two of the impact ejecta layers with dated tsunami events that span the Atlantic Ocean. If this discovery is validated by further research, it implies a much larger tsunami hazard in the Atlantic Ocean than previously reported

Exotic Grains in a Core from Cornwall, NY - Do They Have an Impact Source?

We have found seven discrete layers in a bog core from Cornwall, NY about 80 km away from the Atlantic Ocean. All but two layers contain material that is unlikely to be locally derived. In most cases, the material in the layers has been transported thousands of kilometers from its source area. Six out of the seven layers are difficult to explain except through impact processes. If all of these layers are derived from impacts that produced craters, the data imply a very high impact rate during late Holocene time. In addition, we have been able to associate two of the impact ejecta layers with dated tsunami events that span the Atlantic Ocean. If this discovery is validated by further research, it implies a much larger tsunami hazard in the Atlantic Ocean than previously reported.Мы обнаружили семь отдельных прослоек в пробах донных осадков из Корнвала, штат Нью-Йорк, расположенных около 80 км от Атлантического океана. Все прослойки пробы, кроме двух, содержали материал, который вряд ли является местным. В большинстве случаев этот материал в прослойках перенесен за тысячи километров от района их возникновения. Шесть из семи прослоек трудно объяснить, исключив импактный процесс. Если все эти прослойки получены от импактных воздействий в результате возникновения кратеров, то эти данные подразумевают очень высокие частоты импактных воздействий в период позднего голоцена. Кроме того, мы смогли связать две прослойки, содержащие частицы от импактных воздействий, с данными о цунами, которые охватывали Атлантический океан. Если это открытие подтвердится дальнейшими исследованиями, то это подразумевает гораздо большую опасность цунами в Атлантическом океане, чем сообщалось ранее

Exotic Grains in a Core from Cornwall, NY - Do They Have an Impact Source?

We have found seven discrete layers in a bog core from Cornwall, NY about 80 km away from the Atlantic Ocean. All but two layers contain material that is unlikely to be locally derived. In most cases, the material in the layers has been transported thousands of kilometers from its source area. Six out of the seven layers are difficult to explain except through impact processes. If all of these layers are derived from impacts that produced craters, the data imply a very high impact rate during late Holocene time. In addition, we have been able to associate two of the impact ejecta layers with dated tsunami events that span the Atlantic Ocean. If this discovery is validated by further research, it implies a much larger tsunami hazard in the Atlantic Ocean than previously reported.Мы обнаружили семь отдельных прослоек в пробах донных осадков из Корнвала, штат Нью-Йорк, расположенных около 80 км от Атлантического океана. Все прослойки пробы, кроме двух, содержали материал, который вряд ли является местным. В большинстве случаев этот материал в прослойках перенесен за тысячи километров от района их возникновения. Шесть из семи прослоек трудно объяснить, исключив импактный процесс. Если все эти прослойки получены от импактных воздействий в результате возникновения кратеров, то эти данные подразумевают очень высокие частоты импактных воздействий в период позднего голоцена. Кроме того, мы смогли связать две прослойки, содержащие частицы от импактных воздействий, с данными о цунами, которые охватывали Атлантический океан. Если это открытие подтвердится дальнейшими исследованиями, то это подразумевает гораздо большую опасность цунами в Атлантическом океане, чем сообщалось ранее