Longest known continuous record of the Paleozoic discovered in Yukon wilderness

Hundreds of millions of years ago, in the middle of what would eventually become Canada's Yukon Territory, an ocean swirled with armored trilobites, clam-like brachiopods and soft, squishy creatures akin to slugs and squid.
Ordovician black shales of the Mount Hare Formation, Road River Group (approximately 465 million
 years old) rise above conglomerates of the Aberdeen Member. The dangerous rapids of Aberdeen
 Canyon (Nan Zhak Nadhàdlaii), created by the Peel River cutting th