A much longer and more detailed and generally just plain interesting story about the discovery in Hell Creek:

The Day the Dinosaurs Died

The following day, DePalma noticed a small disturbance preserved in the sediment. About three inches in diameter, it appeared to be a crater formed by an object that had fallen from the sky and plunked down in mud. Similar formations, caused by hailstones hitting a muddy surface, had been found before in the fossil record. As DePalma shaved back the layers to make a cross-­section of the crater, he found the thing itself—not a hailstone but a small white sphere—at the bottom of the crater. It was a tektite, about three millimetres in diameter—the fallout from an ancient asteroid impact. As he continued excavating, he found another crater with a tektite at the bottom, and another, and another.

SHAZAM!

Finding not only the tektites but the *craters* they made in the mud? That. Is. AWESOME.

Can you imagine what one of those little fossilized mud craters would go for at auction? Every museum in the world and a *lot* of private collectors will want a piece of this place.