Documented by Atwater's USGS work in the 1980s-90s: coastal forests subsided one to two meters during the 1700 rupture, tidal salt water killed the cedars, and spruce marshes were buried under tsunami sand, preserved in anaerobic mud with grass stems still pressed in the wave direction. Radiocarbon bracketed the death to 1680-1720; dendrochronology, matching the dead rings against living trees, pinned the last growth season to 1699, winter death before spring 1700. Published as USGS Professional Paper 1707, The Orphan Tsunami of 1700.
The folk telling pairs the forests with the native testimony: the Cowichan, Hesquiaht, and Makah traditions of land sinking and waves in the night turned out to be field reports. The methodological lesson, folk and scholarly alike: the people without seismographs kept the seismograph's secret in story form for centuries.
The claim: ghost forests are the temperate version of the black mat, a disaster horizon you can stand in, evidence that the land keeps its own receipts when no one writes things down. The pattern generalizes: every coast has its drowned witnesses, most unread.
How many catastrophes are standing in plain sight, mislabeled as scenery?