Geologists studying massive chevron formations found something wind alone couldn’t explain: marine microfossils buried in the sand. Here’s the clue—these tiny shells show one smooth side and one side pitted by sandblasting. That means they were likely swept in by a tsunami, then weathered by wind over time. Nature leaves fingerprints—and these fossils may be evidence of ancient ocean waves far larger than anything in recorded history. | The Randall Carlson

After an earthquake rocks the sea floor, marine geologists rush to take samples from the upheaval. #DrainTheOceans | National Geographic TV