Longest known continuous record of the Paleozoic discovered in Yukon wilderness
phys.org
phys.org
Perhaps my sense of adventure is a little different than yours, but if you really want to go than half the adventure is planning the expedition. In this case i'm assuming the place is deliberately being kept secret.
And judging from Google Map there is no "official" routes leading to the south part of the river so it's probably going to be by plane or months of hiking (crazy).