books.google.co.uk - The Proterozoic Biosphere is the first major study of the paleobiology of the Proterozoic Earth. It is a multidisciplinary work dealing with the evolution of the Earth, the environment, and life during the forty percent of Earth's history that extends from the middle of the Precambrian Eon (2500 Ma)...http://books.google.co.uk/books/about/The_Proterozoic_Biosphere.html?id=jMPfQoFNr-IC&utm_source=gb-gplus-shareThe Proterozoic Biosphere
