Geoscience Reference
In-Depth Information
normal
reverse
ungraded
normal, base-only
normal top-only
composite,
symmetrical
Figure A6.7
Different types of
sedimentary grading.
7
5
in
c
re
a
s
in
g
%
m
a
t
r
ix
(
i.
e
.
g
r
a
i
n
s
<
3
0
ยต
m
)
m
u
d
r
o
c
k
s
1
5
w
a
c
k
e
s
0
a
r
e
n
it
e
s
Figure A6.8
Classifi cation of sandstones. (Modifi ed after Pettijohn
et al
. 1973.)
