Sedimentary Rocks (Extra - Udden-Wentworth Scale, Provenances, Pettijohn and Mudrock Classification Flashcards
best to draw for visual:>
1
Q
Size range for Boulder
A
> 256mm
2
Q
Size range for Cobble
A
64-256 mm
3
Q
Size range for Pebble
A
4-64 mm
4
Q
Size range for Granule
A
2-4 mm
5
Q
Size range for Sand
A
0.063-2 mm or 1/16-2 mm
6
Q
Size range for Silt
A
0.0039-0.063 mm or 1/256-1/16 mm
7
Q
Size range for Clay
A
<1/256 mm
8
Q
Phi value for Boulders
A
< -8
9
Q
Phi value for Cobbles
A
-4 to -8
10
Q
Phi value for Pebbles
A
-2 to -4
11
Q
Phi value for Granules
A
-1 to -2
12
Q
Phi value for Very coarse sand
A
0 to -1
13
Q
Phi value for Coarse sand
A
1 to 0
14
Q
Phi value for Medium sand
A
2 to 1
15
Q
Phi value for Fine sand
A
3 to 2
