This is a unique roadside book of the 110 mile loop along Trans-Canada 17 from Goulais Bay to Thessalon and back via Route 638. It is organized in a manner so you can visit outcrops by either following the book or by GPS coordinates within. It explores the Precambrian outcrops common along the transect from the Archean granites, through the Huronian Supergroup, to the post Mid-continental Rift bedrock. There are 35 total outcrops visited. All but three are easily assessable from the roadside. Other road segments include Route 556, Old Soo Road, Gordon Lake Road, Center Line Road, Watson Road, and Government Road. This was a unique time in Earth's history. The Huronian rocks date back almost 2.5 billion years and record many firsts on Earth. The first free oxygen in the atmosphere, the first ice ages, the first time plate tectonics dominates, and the first wide distribution of carbonate rocks. Technical terms are kept to a minimum. Please enjoy and explore your world