A 300 Million Year Old Civilization Existed on Earth

The thesis of this book is that there was a civilization of intelligent beings existing on Earth over 300 million years ago. I previously collected information to write two books on out of place artifacts (OOPAs) and a book on Giants which evidence shows lived on this Earth millions of years ago. While writing my book titled "The History of Intelligent Life On Earth from Millions of Years Ago Till Present" and generating a timeline on ancient OOPAs found around the Earth, I found an interesting pattern.
It turns out that a large number of these objects were from around 300 million years ago mostly in coal mines and seams. All of these objects from the same time period provide good circumstantial evidence that a worldwide civilization existed at that time. Given the millions of years which have elapsed since then we are lucky to find even the few OOPAs we have records of which were preserved in coal and rock.
In this book I put together the evidence and do my best to answer questions like: What did the world look like then? What were the attributes and culture of this society? What types of beings were part of this civilization? And other relevant questions. It may be hard to believe that intelligent life existed back then but we need to be objective to follow where the evidence takes us.