80K views · 1.3K reactions | Southern Madagascar holds chevron dunes, massive triangular deposits pointing back to the sea. Their orientation suggests origin from a single event: a colossal impact at Burckle Crater in the Indian Ocean. Modeling shows the waves could have overtopped escarpments hundreds of feet high, leaving a geologic fingerprint of one of Earth’s most powerful known tsunamis. | The Randall Carlson | Facebook