Figure 14. A hoavily wooded ravine in the loess region. The claief types are J^rnnus Vircjiniana , 

 Hibes r/racilc, Tlmiis fii/va, C Ainen'cana, Qiiercus macrocarpa and occasionally Morus 

 rxthra. (From Yol. V, Iowa Geo!. Surv. ) 



L 



