Imagine a tropical place called Laurentia, covered in shallow seas. Envision squid-like animals with long, pointed shells hunting for food. Picture the first tree sprouting, and the first millipede-like animal crawling onto land. This is not an imaginary world. This is our continent, North America, over 450 million years ago! Journey into the distant past with this book and witness the earliest transformations in what would become North America, when marine life blossomed, and living things first moved onto land.