HOW OLD ARE FOSSILS?
BY
SHARAT K. ROY
Assistant Curator of Invertebrate Paleontology
Geology
Leaflet 9
FIELD MUSEUM OF NATURAL HISTORY
CHICAGO
1927
LIST OF GEOLOGICAL LEAFLETS
ISSUED TO DATE
| No. 1. | Model of an Arizona Gold Mine | $ .10 |
| No. 2. | Models of Blast Furnaces for Smelting Iron | .10 |
| No. 3. | Amber—Its Physical Properties and | |
| Geological Occurrence | .10 | |
| No. 4. | Meteorites | .10 |
| No. 5. | Soils | .10 |
| No. 6. | The Moon | .10 |
| No. 7. | Early Geological History of Chicago | .25 |
| No. 8. | Agate | .50 |
| No. 9. | How old are Fossils? | .25 |
| D. C. DAVIES, Director | ||
FIELD MUSEUM OF NATURAL HISTORY
CHICAGO, U.S.A.
LEAFLET 9.PLATE I.