"Vacation Camps for Girls," Jeannette Marks, D. Appleton.
| ROCK TAPPER[9] SYMBOL—PICK AND SHOVEL |
1. Collect and correctly identify ten rocks found among the glacial boulders.
2. Make photograph or make sketch of glacial boulders.
3. Collect two or three scratched glaciated pebbles or cobblestones in the drift.
4. Make a sketch or photograph of an exposed section of glaciated or scratched bed-rock and note as accurately as you can the direction of the scratches or grooves.
REFERENCES:
"The Story of Our Continent," N. S. Shaler, Ginn and Co.
"The Great Ice Age and Its Relation to the Antiquity of Man," D. Appleton and Co.