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Conditions that preserve fossils are extremely rare. It is commonly agreed by professional and academic biologists that less than 1% of the species which have ever lived have left fossils that we have found. Never mind individuals, we're talking about 99% of all species did not leave fossils for us to discover. Contemplate that. Contemplate the implications. Many of those fossils we do have which were land-based lived in flash flood country, they did not live in forests. Flash floods occur in dry climates with infrequent but catastrophic rainfall and cover dead animals then dry them, maybe for decades, in soil that absorbs the deal animal's moisture when the flood ends. Forests have regular rainfall so that fallen dead things don't dry adequately for preservation and have acidic soils that dissolve bones rather than preserving them. The main exception would be in volcanic ash beds .. we can see that in the John Day / Clarno fossil beds in eastern Oregon for instance. So while we might find recent bigfoot remains, given what we know about where bigfoot reports come from, few are in places that are likely to create fossils to discover later. Edit to add .. so if I were looking for fossils, I'd look in the ash beds near the Cascade volcanoes or in the dry washes on the east slope of the Cascades, maybe east slope of the Rockies. I think most other places in the continental US get too much rainfall for preservation needed to produce fossils. MIB