This book was prepared by the Educational Extension Section of the
Illinois State Geological Survey, principally Betty Jean Hanagan, I.
Edgar Odom, and Shirley J. Trueblood, under the direction of George M.
Wilson. They were assisted by other members of the Survey staff,
especially J. E. Lamar and J. C. Bradbury of the Industrial Minerals
Section.
Educational Extension also serves the public by assembling and
distributing rock and mineral collections for Illinois educational
groups, giving lectures, preparing exhibits, answering queries about
identification of rocks and minerals, reporting Survey news, and
conducting earth science field trips.
During each year six field trips are conducted in widely separated parts
of the state for teachers, students, and laymen. The general program is
especially designed to assist in teaching the earth 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_]