SoilScience.info
Lithic Ustorthent (Loamy-skeletal, mixed, active, mesic) -- Pima County, Arizona
This photo was taken in Pima County, Arizona. The soil is formed from granite rock and creep material on a 35% slope at an elevation of 7,240 feet. A lithic contact is present at 40 cm. A few tree roots are present below that contact but the horizontal spacing is greater the 10 cm. The soils support sparse stands of Ponderosa Pine. Little timber has been harvested from these sites due to the difficult terrain and the low density of mature trees. Tree growth is slow and mature pines are usually of small stature.
Lithic Ustorthent (Loamy-skeletal, mixed, active, mesic) -- Pima County, Arizona
This photo was taken in Pima County, Arizona. The soil is formed from granite rock and creep material on a 35% slope at an elevation of 7,240 feet. A lithic contact is present at 40 cm. A few tree roots are present below that contact but the horizontal spacing is greater the 10 cm. The soils support sparse stands of Ponderosa Pine. Little timber has been harvested from these sites due to the difficult terrain and the low density of mature trees. Tree growth is slow and mature pines are usually of small stature.