Thickness	Group Code 1	Group Code 2	Group code 3
no data	0	0	0
< 0.25 m	1	1	1
< 0.5 m	2	1	1
0.25-0.5m	3	1	1
"<0.5 m, < 1.0 m"	4	2	2
0.5-1.0 m	5	2	2
0.5-1.5 m	6	3	2
1.0-1.5 m	7	3	2
"1-2 m, 0.5-1.5 m"	8	3	2
<2.0 m	9	4	2
1.0-2.5 m	10	5	3
1.5-2.5 m	11	5	3
1-3 m	12	5	3
2-3 m	13	6	4
2-4 m	14	6	4
2.5-5 m	15	6	4
"2-4 m, 2.5-5 m"	16	6	4
1-6 m	17	6	5
3-6 m	18	7	6
4-6 m	19	7	6
5-7.5	20	8	7
5-10 m	21	9	7
6-9 m 	22	9	7
6-10 m	23	9	7
6-12 m	24	10	8
>7.5 m	25	11	9
> 9 m	26	11	9
> 10 m	27	11	9
12-18 m	28	12	10
10-20 m	29	13	10
18-30 m	30	14	11
> 20 m	31	15	11
Eolian Sand	32	16	12