azonal

(ā′zōn′əl)

adjective

designating or of zones, or layers, of soil that cannot be sharply distinguished from one another because, for example, they are of recent formation

See azonal in American Heritage Dictionary 4

adjective

Not divided into zones.
Geology Of or relating to soils characterized by poorly developed horizons and by a strong resemblance to the parent material.

link/cite print suggestion box

More from YD