Megaflood boulder deposits compared between south Sinai wadis and Snake River Canyon

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Key facts

• Published work on extreme floods in wadis of south Sinai, including Wadi Isla, used boulder transport and rainfall-runoff modelling to reconstruct a cataclysmic flood event, with the presenter speculating a date of roughly 11,000-14,000 years for the Pleistocene-Holocene transition.
• Imbrication - a systematic stacking orientation of clasts - is described as diagnostic of water transport rather than glacial transport, and is illustrated in Sinai wadi outwash and at the mouth of the wadis.
• The video argues the same category of pluvial event could have produced the sheet floods needed to erode the Sphinx enclosure walls.
• The Snake River Canyon in southern Idaho, and Hell's Canyon, are described as being cut by a megaflood at the end of the last ice age; the Swan Falls boulder bar is 3-5 miles long and a couple hundred feet thick, composed of boulders ripped out of the canyon bedrock.
• The video asks whether the Sinai and Snake River flood events are unrelated, or whether they require a common cause able to affect both sides of the planet.
• A 1960 geomorphology textbook cited in the video states that the valley west of the Nile at Luxor containing the royal tombs appears water-eroded while the tombs themselves show no destructive water action, and concludes that significant water action probably ceased at least 4,000 years ago but sometime earlier.

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