Group

Class

Subclass

Classification criteria

Genesis

GRAVELOUS SOILS

GL

GL1

F < 20% F. Ip < 300

Lateritic Gravels

GL2

20% < F< 30% F. Ip < 600

or F < 20% 300 < F. Ip < 600

GL3

F > 30% or F. Ip > 600

G

G1

F < 15% F. Ip < 180

Alluvial and

Eluvionaries gravels

G2

F > 15% F. Ip < 500 or

F < 15% 180 < F. Ip < 500

G3

F. Ip > 500

Ge

Ge1

cf. G1

Gravel of eruptive origin

Ge2

cf. G2

Ge3

cf. G3