Download or read book Pictorial Guide to North American Trilobites written by Joseph J. Kchodl and published by . This book was released on 2018-02-18 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A beginners guide to Trilobites of North America. Once so common the Cambrian Period was called "The Age of Trilobites", these creatures lived, thrived and died long before the Age of Dinosaurs.