Introduction - Soil Geography of the USA: A Diagnostic-Horizon Approach - page 3

Table 1.2 Diagnostics of epipedons at different taxonomic levels in ST
Epipedon Order Suborder Great group Subgroup

Anthropic Inceptisols Aridisols Entisols, Ultisols

Folistic Histosols Gelisols Andisols, Gelisols, Inceptisols,

Spodosols

Histic Histosols Gelisols Gelisols,

Inceptisols
(Hum-)

Alfisols, Andisols, Entisols,
Gelisols, Inceptisols (Histic or
Humic), Mollisols, Oxisols,
Spodosols

Melanic Andisols,

Inceptisols
(Hum-)

Andisols (Humic)

Mollic Mollisols Gelisols,

Inceptisols
(Hum-),
Ultisols
(Hum-)

Alfisols (Udollic, Mollic), Andisols
(Thaptic, Pachic, Humic),
Entisols, Inceptisols (Humic,
Mollic), Ultisols (Umbric)

Ochric Alfisols (Alb-),

Ultisols
(Alb-)

Alfisols (Aeric)

Plaggen Inceptisols

(Anthr-)

Inceptisols Entisols, Spodosols

Umbric Inceptisols

(Hum-),
Gelisols,
Ultisols

Alfisols, Andisols (Humic),
Inceptisols (Humic), Spodosols,
Ultisols

Table 1.3 Diagnostics of subsurface horizons at different taxonomic levels in ST a
Subsurface
horizon Subgroup b

Order Suborder Great group

Agric [None]

Albic Mollisols,

Spodosols

Alfisols, Ultisols Alfisols (Albic, Albaquultic,
Albaquic), Andisols
(Spodic), Mollisols
(Alfic)

Argillic Alfisols

(Ultisols)

Aridisols,
Mollisols

Aridisols,
Gelisols,
Mollisols
(Argi-, Pale-)

Alfisols (Haplargidic),
Andisols (Ultic, Alfic),
Aridisols (Xeralfic,
Ustollic, Argic,
Natrargidic), Entisols
(Alfic, Ultic), Inceptisols
(Ruptic-Alfic), Mollisols
(Argic, Argiduridic,
Calciargidic,
Paleargidic, Palexerollic,
Ultic), Spodosols (Alfic,
Ultic, Argic, Aqualfic)
(continued)