Laura Sullivan 
Soil for Fossils and History [PDF ebook] 

We can thank soil for most of what we know about both the ancient and prehistoric worlds. It is soil that turned plants and animals into fossils, and then preserved them so we can discover them today. It is also soil that covered the ruins of civilizations and kept them safe from ruinous erosion so we can study the lives of our ancestors. This book details developments in archaeology and how they can help us learn even more about our distant past.