_Field Book_ PENNSYLVANIAN PLANT FOSSILS OF ILLINOIS Charles Collinson Romayne Skartvedt _Illinois State Geological Survey Educational Series 6_ [Illustration: uncaptioned] STATE OF ILLINOIS DEPARTMENT OF REGISTRATION AND EDUCATION First edition 1960 Reprinted 1966 ILLINOIS STATE GEOLOGICAL SURVEY URBANA ILLINOIS John C. Frye, Chief Printed by Authority of State of Illinois, Ch. 127, IRS, Par. 58.25. _Field Book_ PENNSYLVANIAN PLANT FOSSILS OF ILLINOIS Charles Collinson Romayne Skartvedt [Illustration: uncaptioned] _Illustrations by Marie E. Litterer_ FOREWORD [Illustration: Illuminated T] This field book is intended to guide beginners in their collection and general classification of plant fossils. It illustrates the plant fossils most commonly found in Illinois and relates them to the plants of which they were a part. A list of publications that will furnish more detailed identification of specimens is included. The book has been prepared in response to numerous inquiries to the Illinois State Geological Survey from amateur collectors. Information has been drawn from numerous sources. The works of Hirmer, Janssen, Lesquereux, Noé, and Langford have been particularly useful. We are especially indebted to Dr. Robert M. Kosanke, paleobotanist at the Illinois State Geological Survey, and Dr. Wilson N. Stewart, professor of botany of the University of Illinois, for helpful suggestions and use of their libraries. KEY TO PLANTS ILLUSTRATED ON TIME CHART