Part 6

When a fossil is so delicate that the surface tension of the gum arabic solution causes the fossil to “spread,” celluloid (not plastic) dissolved in acetone should be substituted. Before this solution is used, the specimen must be completely dry or the coating will become cloudy or opaque.

If the specimen is pyritized, it should be sprayed with lacquer or shellac to prevent disintegration. If these protective sprays are used they must be applied to dry specimens during dry weather or the coating will remain sticky.

REFERENCES

AN INTRODUCTION TO PALEOBOTANY. C. A. Arnold. McGraw-Hill Book Co., New York, 1947, 433 p.

GRUNDY AND WILL COUNTIES. Frank H. Bradley. In Worthen et al., Geology and Paleontology, Geological Survey of Illinois, vol. IV, 1870, p. 190-225.

PALMLIKE PLANTS FROM THE DOLORES FORMATION (TRIASSIC), SOUTHWESTERN COLORADO. Roland W. Brown. United States Geological Survey Professional Paper 274-H, 1956, p. 205-209.

CARBONIFEROUS INSECTS FROM THE VICINITY OF MAZON CREEK, ILLINOIS. F. M. Carpenter. Illinois State Museum Scientific Paper 3, pt. 1, 1943, p. 7-20.

THE LIVING CYCADS. C. J. Chamberlain. University of Chicago Press, Chicago, 1919, 172 p.

GUIDE FOR BEGINNING FOSSIL HUNTERS. Charles Collinson. Illinois State Geological Survey Educational Series 4, 1956, 36 p. (Revised 1959, 40 p.)

HISTORICAL GEOLOGY. Carl O. Dunbar. John Wiley & Sons, Inc., New York, 1949, 576 p.

COLLEGE BOTANY. Harry J. Fuller and Oswald Tippo. Henry Holt & Co., New York, 1954, 993 p.

HANDBUCH DER PALÄOBOTANIK, BD. 1: THALLOPHYTA, BRYOPHYTA, PTERIDOPHYTA. Max Hirmer. R. Oldenbourg, Munich and Berlin, 1927, 708 p.

SOME FOSSIL PLANT TYPES OF ILLINOIS. Raymond E. Janssen. Illinois State Museum Scientific Paper 1, 1940, 124 p.

LEAVES AND STEMS OF FOSSIL FORESTS. Raymond E. Janssen. Illinois State Museum Popular Science Series; v. 1, 1957, 190 p.

THE MAZON CREEK EURYPTERID: A REVISION OF THE GENUS LEPIDODERMA. Erik N. Kjellesvig-Waering. Illinois State Museum Scientific Paper 3, no. 4, 1948, p. 3-46.

PLANTS OF THE PAST. F. H. Knowlton. Princeton University Press, Princeton, N. J., 1927, 275 p.

THE WILMINGTON COAL FLORA FROM A PENNSYLVANIAN DEPOSIT IN WILL COUNTY, ILLINOIS. George Langford. Esconi Associates, Downers Grove, Ill., 1958, 360 p.

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.

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

Morris Braidwood Peoria Colchester Danville Springfield Duquoin Murphysboro Harrisburg Marion