THE MAZON CREEK, ILLINOIS, SHALES AND THEIR AMPHIBIAN FAUNA. R. L. Moodie. American Journal of Science, 4th Series, v. 34, 1912, p. 277-285. INTRODUCTION TO HISTORICAL GEOLOGY. Raymond C. Moore. McGraw-Hill Book Co., Inc., New York, 1958, 656 p. PENNSYLVANIAN FLORA OF NORTHERN ILLINOIS. A. C. Noé. Illinois State Geological Survey Bulletin 52, 1925, 113 p. PENNSYLVANIAN INVERTEBRATES OF THE MAZON CREEK AREA, ILLINOIS. Eugene S. Richardson, Jr. Fieldiana: Geology, v. 12, 1956, p. 1-76. REPORT ON THE CARR AND DANIELS COLLECTIONS OF FOSSIL PLANTS FROM MAZON CREEK. Wilson N. Stewart. Illinois Academy of Science Transactions, v. 43, 1950, p. 41-45. A RECENTLY DISCOVERED _PHLEGETHONTIA_ FROM ILLINOIS. W. D. Turnbull and Priscilla F. Turnbull. Fieldiana: Zoology, v. 37, 1955, p. 523-535. [Illustration: uncaptioned] EDUCATIONAL EXTENSION PROGRAM The Educational Extension Section of the Illinois State Geological Survey reaches the public through a number of channels, including nontechnical publications, rock and mineral collections for Illinois schools and educational groups, lectures, exhibits, correspondence involving identification of rocks and minerals, news items for the press, and field trips. During each year six field trips are given, in widely separated parts of the state, for teachers, students, and laymen. The general program is especially designed to assist in teaching geological sciences and to help make Illinois citizens aware of the state’s great mineral wealth. Illinois State Geological Survey Urbana, Illinois [Illustration: ILLINOIS, Land of Lincoln] [Illustration: PENNSYLVANIAN OUTCROP AREA] Morris Braidwood Peoria Colchester Danville Springfield Duquoin Murphysboro Harrisburg Marion _Illinois State Geological Survey Educational Series 6_ Transcriber’s Notes —Silently corrected a few typos. —Retained publication information from the printed edition: this eBook is public-domain in the country of publication. —In the text versions only, text in italics is delimited by _underscores_.