2.1 Glacial Deposits
a
Ij\
PATTERNED
GROUND
;}
I
I
GlACIAL
I
I
RETREAT
R
AND
UPLIFT
I
I
I
OUTWASH
I
I
I
I
I
I
I
I
LOOGEMENT i
I
l'
A
I
A, GLACIAL ADVANCE
R, GLACIAL RETREAT
TllL
A
Fig. 2.6. a Glaeial deposits on eontinental shelf, originating from one advanee and subsequent retreat of
iee, aeeompanied by lowering and raising sea level,
as weIl as some isostatie subsidenee and following
uplift due to the growing and waning iee load. b-d
Simplified sequenees of one glaeial eycle. b Asymmetrie eycle along the eoast with raised beaeh,
On the other hand, large and "dirty" valley glaeiers
reaehing the sea ean provide great amounts of
(mainly silieiclastie) debris and aeeumulate thiek
LOW
SEA LEVEL
NORMAL MARINE
MUD AND SAND
TWASH
LODGEM.
TlLL
27
PROGLACIAL MUD
WITH DROPSTONES
OR DIAMICT
SUBMARINE
OUTWASH
d
/f\
I
I
R
MUD
FLOW
.• 0 _ •. ~ •• :
o - . C>
MARINE
I
• _ 0
D
DIAMICT
Q
0
l;)
p ~
a" "
_ •• _ _ .9 •
. ,,- .. >.:A
- .. . . . -
MUD WITH DROPST.
NORMAL
MARINE
MUD
glaeiomarine diarniet representing only a short interval. c Mid-shelf eycle showing several marine and
non-marine subseetions. d FuIly marine symmetrie
eycle where the maximum advanee of iee is represented by relatively eoarse-grained diamiet. (Based
on several sourees, e.g., Boulton and Deynoux 1981;
Eyles 1984; Edwards 1986)
glaeiomarine sequenees in the deep sea or in subsiding areas.