Geoscience Reference
In-Depth Information
Table 6.2 (continued)
Order
Suborder
Great group
Subgroup
Series
Umbric
a
Ultisols
Aquults
Fragiaquults
1
Arenic umbric
a
Kandiaquults
0
Umbric
a
0
Arenic umbric
a
Kanhaplaquults
0
Umbric
a
0
Arenic umbric
a
Paleaquults
2
Umbric
a
5
Umbraquults
a
Typic
17
25
Total
587
a
May include mollic or umbric
b
May include histic, melanic, mollic, or umbric
Fig. 6.2 Counties with a “taxonomic” umbric epipedon in the USA
also occur in NC, CO, Alaska (AK), Michigan (MI), and elsewhere in the USA. The
analysis contained herein suggests that soils with an umbric epipedon comprise
about 233,000 km
2
, or only about 2.7 % of the soil area of the USA. However, this
value is likely a gross underestimate, in view of the difficulty in identifying soils
with an umbric epipedon taxonomically.
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