It is quantitatively corroborated by close morphological and dynamical similarities between megaripples and ordinary sand dunes, which had remained unnoticed because of the enormous difference in size ...

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Massive megaripples, formed by the tsunami after the Chicxulub asteroid impact 66 million years ago, have been mapped deep beneath Louisiana using 3D seismic data.

These megaripples were deposits of sediment distributed in what was then the ocean floor, but now forms part of Louisiana. In a new study led by Kinsland, the team further mapped the shelf using ...

“The megaripples are different on the slope, at the shelf break and further up the shelf,” Kinsland, the lead author of the new study, told Live Science.

In the case of these megaripples, a massive earthquake following the impact event seems to have first fluidised a layer of sediment, which was then shaped into waveforms by high-speed tsunami waves.

Scientists have created a new map of "mega ripples" on the seafloor caused by the Chicxulub asteroid impact that wiped out the dinosaurs, revealing further the events that led to the devastating ...

These megaripples also appear to have formed differently compared to how conventional sea waves cause ripples on beaches by moving sand particles. ADVERTISEMENT In the case of these megaripples, a ...

Paleo-megaripples – as seen in Mars’ Terra Sirenum by the High-Resolution Imaging Science Experiment (HiRISE). Image credit: NASA/JPL/University of Arizona. DOWNLOAD PDF VERSION.

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A huge flood, anywhere from 700 to 1,000 feet deep at this point, created the megaripples. The flood ripped across the region at the close of the last Ice Age.