Evidence for widespread deeply weathered soils in the Paleocene can be seen in abundant oxisols and ultisols in now-heavily glaciated Scotland and Antarctica.
12.
Mockernut hickory grows primarily on Ultisols occurring on an estimated 65 percent of its range, including much of the southern to northeastern United States.
13.
In eastern North America, Alfisols are commonly found in glaciated areas while Ultisols are restricted to the areas south of the limit of maximum glaciation.
14.
Alfisols and ultisols emerged in the late Devonian and early Carboniferous, and have a continuous, though not rich, fossil record in eras since then.
15.
The above soil orders in sequence of increasing degree of development are Entisols, Inceptisols, Aridisols, Mollisols, Alfisols, Spodosols, Ultisols, and Oxisols.
16.
Ultisols vary in color from purplish-red, to a bright reddish-orange, to pale yellowish-orange and even some subdued yellowish-brown tones.
17.
While the term is usually applied to the red clay soils of the Southern United States, ultisols are also found in regions of Africa, Asia, and South America.
18.
Ultisols are the dominant soils in the Southern United States ( where the Cecil series is most famous ), southeastern China, Southeast Asia, and some other subtropical and tropical areas.
19.
Like other well-drained Ultisols, it is ideal for urban development; however, in common with other kaolinite-dominated clays, it has little ability to recover from soil compaction.
20.
A wide range of soil fertility exists as evidenced by soil orders-Alfisols and Mollisols which are medium to high in base saturation to Ultisols which are low in base saturation ( 24 ).
