Group

Class

Subclass

Classification criteria

Genesis

FINES SOILS

A

A1

F. Ip < 1300 and F. Ip. G < 800

Alteration clays of the crystalline and crystallophyll base, schisto-sandstone rocks, and sedimentary formations of the graben

A2

1300 < F. Ip < 2500 and F. Ip. G < 1500 or

F. Ip < 1300 and 800 < F. Ip. G < 1500

A3

F. Ip > 2500

F. Ip. G > 1500

Ae

Ae1

cf. A1

Cretaceous and Quaternary sedimentary clays and alteration clays of eruptive formations

Ae2

cf. A2

Ae3

cf. A3