Standard deviations (m)

Areas (% of total)

Alluvial deposits

Marine sediments

Barreiras group

0.1 to 1

2.5

3.2

0.4

1.1 to 2

39.7

60.9

9.1

2.1 to 3

28.7

35.5

34

3.1 to 4

20.8

0.4

45.7

4.1 to 5.8

8.3

0

10.8