Layer

Thickness (cm)

Number of pebbles

Long axis (cm)

Short axis (cm)

Sandy layer

70

24

6.5

4.5

4.4

2.4

3.0

3.0

3.2

2.7

2.0

2.4

1.8

2.0

2.1

1.2

1.0

0.9

1.2

1.7

1.0

0.7

0.5

0.6

0.3

0.4

3.6

2.5

1.7

2.1

0.6

1.5

2.0

1.3

1.3

1.6

1.0

1.1

1.3

0.6

0.3

0.1

0.5

0.8

0.4

0.3

0.3

0.2

0.2

0.2