Long ago, massive Ice Age beasts bogged down in the salty mire of Boone County. They died there by the hundreds. In 1807, William Clark arrived at the site under direct orders from President Thomas Jefferson. Jefferson wanted bones. Clark delivered, excavating thousands of specimens of mammoths, mastodons, and ancient bison. He sent these skeletal remains back to Washington. Some actually ended up laid out on the floor of the White House East Room. This wasn't just a basic grave dig. The site single-handedly launched the field of American vertebrate paleontology.

Before these discoveries, most scientists believed species could not go extinct. They were wrong. The massive teeth and jawbones pulled from the Kentucky mire shattered that comforting myth. French naturalist Georges Cuvier analyzed the specimens. He proved these beasts had vanished. President Jefferson, though, remained stubbornly obsessed with the idea that living mammoths still roamed the unexplored West. He even told Lewis and Clark to keep their eyes peeled for herds. They found nothing. Instead, this Boone County swamp forced humanity to accept a cold, hard truth. Extinction was real.