Re: Perudic moisture regime..and other....

You are correct that Soil Taxonomy provides unique taxa for soils with a perudic moisture regime only
in the Oxisol order. The perudic regime is not excluded from the taxa you mention.

Perudults: By naming convention would be Perults. Such soils are unlikely to occur. We believe the
formation of the argillic horizon requires periods of drying to form the clay films. A kandic horizon is
more likely as it does not require clay films.

Perudepts: By naming convention would be Perepts at the suborder level. Inceptisols with a perudic
moisture regime are known to occur. Unique taxa for such soils could be proposed. Taxa could be
proposed at the suborder (Perepts), great group (Perudepts), or subgroup (Perudic) level depending on
extent and importance of such soils. (They are at the suborder level in Oxisols).

Perverts: By naming convention would be Pererts. Such soils are unlikely to occur. The formation of
cracks and slicken sides requires periods of drying.

Changes to the plinthite definition: ""will not slake after being in immersed in water for 24 hours"". I
think the addition of a slaking criterion would be helpful. It will take some study to satisfactorily define
the slaking and rupture resistance separation between plinthite and ironstone.