Geoscience Reference
In-Depth Information
1 BOUNDARIES
4 DRIFT SYMBOLS
7 FAULTS
80
observed boundary
boundary inferred
alluvium
marine alluvium
fault contact with dip
sense of slip on strike-
slip fault
covered contact
peat
sense of slip on dip-slip
fault (D = down, U = up)
thrust fault, barbs on
upper plate
U
younging direction
alluvium boundary
head
glacial sand and gravel
till
glacial lake deposits
D
outline of exposure
(with locality number)
12
shear zone
fault, position uncertain
break of slope
5 LINEAR FEATURES
fault, existence uncertain
moraine ridge
bearing and plunge of
fold axis or lineation
lineation, vertical
63
mineral vein, with
element symbols
8 MISCELLANEOUS
fossiliferous site
mine adit (blocked)
mine shaft
limit of metamorphic
aureole (+++ nearer
intrusion)
lineation, horizontal
6 FOLDS
water well
2 BEDDING
minor fold axial plane
trace of axial surface or
crest of anticline, with
plunge
borehole
strike and dip of
bedding
14
14
or
14
trace of axial surface or
trough of syncline, with
plunge
anticline with
overturned limb
overturned bedding
vertical bedding
horizontal bedding
or
38
crumpled bedding
syncline with
overturned limb
3 OTHER PLANAR FEATURES
strike and dip of foliation,
cleavage or schistosity
trace of axial surface
with bearing and
plunge of fold axis
27
17
overturned anticline
with bearing and
plunge of fold axis
minor fold axis with
vergence
vertical foliation,
cleavage or schistosity
30
strike and dip of joints
or dykes
45
vertical joints or dykes
Figure A10.3
A selection of symbols for use in preparing geological maps. Alternatives are given for some of
the symbols.
