A persistent school of thought in recent years has held that so-called "chevrons," large U- or V-shaped formations found in some of the world's coastal areas, are evidence of megatsunamis caused by asteroids or comets slamming into the ocean.
University of Washington geologist and tsunami expert Jody Bourgeois has a simple response: Nonsense.
The term "chevron" was introduced to describe large dunes shaped something like the stripes you might see on a soldier's uniform that are hundreds of meters to a kilometer in size and were originally found in Egypt and the Bahamas.
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Comment: The only problem with this debunking theory is that the chevrons in Madagascar are made of material from the ocean floor with sediment hundreds of meters deep and containing microfossils that are fused with metals typically formed by cosmic impacts.
Unless sea level has changed drastically in 5,000 years this "counter theory" (which is not a theory at all since it's not explaining what has caused these chevrons) is far more worthless than the theory it's trying to replace.