In the winter of 1969 to 1970, the bank at the edge of a Makah village site on the northwestern coast of Washington State began to slump.

A storm had saturated the ground, and when the earth moved, it exposed something that had not seen light or air for approximately five centuries: wooden objects, still intact, pressed into the gray-green mud of an ancient earthen seal.

This would not have happened in ordinary soil.

Wood does not last 500 years in dry ground or in the acidic soils of a temperate rainforest.

It decays within years, within decades if conditions are slightly better than typical.

But the specific mud of Ozette was different.

It had buried the village in an oxygen-poor, waterlogged environment that functioned, across five centuries, as a kind of accidental vault.

Nothing had touched what lay within it since the catastrophe that created the seal in the first place.

The people who recognized what was being exposed by that winter storm were members of the Makah Tribe.

They had been living on the northwestern tip of the Olympic Peninsula for time that extended far beyond any written record.

And they had carried, in their oral history, the memory of a great slide that had buried part of their village.

The catastrophe had a name in their tradition.

The community had already been remembering it.

What archaeology would eventually confirm was this: a mudslide had buried six longhouses at the Ozette village site roughly 500 years earlier, give or take about 50 years.

The mud had preserved them with an intimacy that archaeologists almost never encounter.

When excavation finally began, in 1970, the site became one of the most significant North American archaeological discoveries of the twentieth century.

By the time the fieldwork ended, approximately 11 years later, more than 55,000 artifacts had been recovered, including hundreds of wooden objects that had no business surviving at all, and yet had.

Those objects changed the way researchers and the public understood what Northwest Coast life had looked like before sustained European contact.