As a UNESCO World Heritage Site, the Joggins Fossil Cliffs offer an unprecedented glimpse into the Earth's history. Bearing fossils of organisms from the lush, tropical forests that existed in the Coal Age -- when the continents were assembled into one huge land mass or supercontinent, Pangea -- Joggins traces, through layers of sediment, the massive environmental and geologic shifts that have occurred in the planet in the intervening millennia. From...