Field, laboratory, and library manual in physical geography . Fig. 41. A Young Fir Tree growing from a Crack in a Mass of Granite. Fig. 42. A Weir on the Truckee River, Nevada, for measuringWater used for Irrigation 101 162 PHYSICAL GEOGRAPHY MANUAL Shale is a fragmental rock. Can you readily see the frag-ments ? Account for the color of the specimen which you have.(See Exercise LXV.) Fragmental rocks are usually built under the water, and thematerials of which they are composed are furnished by riversand by the action of waves. Which of the fragmental rocks

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