trace quantities of weatherable primary aluminosilicates. The texture

is finer than sandy loam and the horizon has more than 15% clay, with no

or very few clay skins.

 The soil is an Oxisol because 1) the oxic horizon in the top 2 m,

2) there is no plaggen epipedon, and 3) there is neither an argillic nor

natric horizon above the oxic horizon. The soil is in the Orthox

suborder, because it has no continuous phases of plinthite within 30 cm

of the surface, is not saturated with water at any time during the year,

has neither a torric nor an ustic moisture regime, and has less than 16

kg of organic carbon per square meter to a depth of 1 m. The soil is in

the Gibbsiorthox great group, by virtue of the presence of a horizon

within 1.25 m of the surface that contains 20% or more by volume of

gravel-sized aggregates that contain 30% or more of gibbsite. This

Gibbsiorthox is in turn Typic, because the gibbsitic gravel is within 50

cm of the surface and there are no mottles in the upper 1 m of the soil.

 The particle-size class of the soil is clayey-skeletal, because

 gravel makes up 35% or more by volume and the fine earth contains 35% or

 more clay by weight. The mineral class is oxidic, because the soil

 contains less than 90% quartz and less than 40% each of hydrated

 aluminum (reported as gibbsite or bohemite) and iron oxides extractable

 by citrate-dithionite, and the sum of the percentages of these two

 mineral groups divided by the percent clay is greater than 0.2.

 Therefore, the family designation for the soil is clayey-skeletal,

 oxidic, isohyperthermic, Typic Gibbsiorthox.