Table 2 Distribution of the Roundness of Pebbles versus Distance based on Drake’s (1972) studies

Roundness #

.9

0.16

-

-

-

-

-

-

-

-

-

-

-

-

-

.8

0.65

-

-

-

-

-

-

-

-

-

-

-

-

-

.7

2.29

-

1.75

-

-

-

3.03

6.06

-

-

-

-

-

-

.6

14.54

12.5

21.05

19.05

71.43

33.33

36.36

31.43

33.33

60

33.33

-

66.67

-

.5

45.26

47.22

53.51

33.33

28.57

66.66

46.97

48.51

58.33

40

33.33

66.67

 

100

.4

21.56

23.61

21.05

38.1

-

-

13.64

11.43

8.33

-

33.33

33.33

33.33

-

.3

8.01

9.7

2.63

9.52

-

-

-

-

-

-

-

-

-

-

.2

4.74

4.16

 

 

 

 

 

2.86

 

 

-

-

-

-

.1

2.78

2.78

-

-

-

-

-

-

-

-

-

-

-

-

Angular distance miles

1 mi.

2 mi.

2.5 mi.

3-4 mi.

4-5 mi.

5-6 mi.

7 mi.

7-8 mi.

8-9 mi.

9-11 mi.

12-13 mi.

13-14 mi.

16-17 mi.

20-21 mi.

 

Table 3  Distribution of the breakage of pebbles versus distance based on Drake’s (1972) study

Group Breakage

3

48.27

41.77

57.52

52.17

100

100

27.0

28.21

33.33

100

100

21.43

100

100

2

23.84

35.44

23.84

34.13

-

-

55.41

64.10

66.67

-

-

35.71

-

-

1

27.84

22.78

18.58

8.69

-

-

17.57

7.69

-

-

-

42.86

-

-

Distance

0-1 mi.

1-2 mi.

2-3 mi.

3-4 mi.

5 mi.

6 mi.

7 mi.

8 mi.

9 mi.

10 mi.

12 mi.

14 mi.

16-17 mi.

21 mi.

 

Table 4  Distribution of roundness for boulders from Stony Brook.

Round-ness no.

Granite S

Gneiss S

Granite P

LineatedGranite

Granite A

Gneiss A

Pegmatite A

Pegmatite K

Quartzite

Basalt

.8

-

2.86

-

-

-

2.94

2.56

7.61

-

.7

1.61

5.71

-

7.64

-

2.99

2.56

15.38

14.29

.6

14.52

11.43

57.14

17.95

16.22

5.88

35.24

7.64

17.86

.5

12.90

5.71

28.51

35.90

37.83

23.53

23.08

23.08

42.86

.4

19.95

28.57

7.14

7.64

18.92

38.24

15.38

 

21.43

.3

30.65

20

7.14

10.26

21.62

20.54

25.64

38.46

-

.2

16.13

22.86

-

20.51

5.40

2.94

-

7.69

3.57

.1

4.84

2.86

-

-

2.70

2.94

-

-

-

 

Table 5 Distribution of breakage for boulders from Stony Brook

Category of breakage

Granite S

Gneiss S

Granite P

LineatedGranite

Granite A

Gneiss A

Pegmatite A

Pegmatite K

Quartzite

Basalt

3

30.65

25.71

64.29

43.54

35.14