WJEC A2 Geology

1
WJEC A2 Geology
BGS Mapwork Exercises
I.G.Kenyon
2
The Geology of Hadrians Wall
N
Quartz Dolerite
Describe the strike and dip of the
rocks shown on the map extract Outline,
using map evidence the likely
form of the quartz dolerite intrusion
3
The Geology of Wenlock Edge, Shropshire
X
9
N
10
Silurian Rocks
Y
Describe the strike and dip of the beds shown on
the extract above
4
Geology and Topography of Wenlock Edge,
Shropshire
X
Y
Aymestry Limestone
Periglacial Head
Boulder Clay
Upper Ludlow Shales
LowerLudlow Shales
Wenlock Limestone
Cross section along line X-Y from the map on the
previous slide
Using the geology map on the previous slide
and the cross section above, outline the
relationship between lithology and topography
5
Clitheroe 150,000 Sheet 68 Solid Drift
Describe the strike and dip of the beds in this
box
Suggest reasons to explain the V-shaped outcrop
pattern here
6
Ayr 150,000 Sheet 14(W) Solid
Describe the likely form of the igneous intrusion
here
This fault dips South West, identify the type of
fault
Describe and identify the fold structure within
this box
7
Exeter 1 inch 1 mile Sheet 325 Solid Drift
N
Carboniferous grits and
shales
Basic igneous rocks
Using this slide and the next, try to identify
the types of igneous features
Permo-Triassic breccias and conglomerates
8
Exeter 1 inch 1 mile Sheet 325 Solid Drift
Identify the types of igneous features
Dolerite (D)
Perm-Triassic breccias and conglomerates
Carboniferous grits and shales
Basalt(B)
Tuffs
Section along southern margin of the map of
previous slide
9
Hexham 1 inch 1 mile Sheet 19 Solid
Identify the main fold structure in the yellow
box, refer to dip and strike values, symmetry and
plunge where appropriate
10
Okehampton 1 inch 1mile Sheet 324 Solid Drift
Describe the outcrop pattern of igneous rock D
and identify the type of intrusion
Line of cross section on next slide
Granite
Estimate the width of the metamorphic aureole
around the granite above
11
Okehampton 1 inch 1mile Sheet 324 Solid Drift
Describe the fold structure between
A and B on the cross section below
A
B
What map evidence is there to confirm that this
part of the bed is overturned? How could you
confirm this in the field?
12
LLandrindod Wells 125,000 Sheet 15/16 Solid
Describe the map evidence to suggest there is a
plunging syncline and anticline on the extract
above. In which direction are the folds plunging?
13
LLandrindod Wells 125,000 Sheet 15/16 Solid
N
This fault plane dips East at 76 Identify the
fault type
14
Harlech 150,000 Sheet 135 Solid
This fault dips SSE at 70 Identify the type of
fault
C
D
Describe and identify the major fold structure
along line C D. Refer to strike and dip,
symmetry and plunge where appropriate
15
Wrexham 150,000 Sheet 121 Solid
Compare and contrast the strike and dip values of
the Silurian (b) and Carboniferous (d) Beds
What happens to the conglomerate here?
This bed is a basal conglomerate, explain the
significance of this with respect to the junction
between the Silurian and Carboniferous beds
Carboniferous
Silurian
16
Brough-under-Stainmore 150,000 Sheet 31 Solid
Using map evidence, describe and explain the
outcrop of the Carboniferous beds in the NE
corner of the extract
F
The Hilton Fault dips SW at 80 Identify the
fault type
E
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Brough-under-Stainmore 150,000 Sheet 31 Solid
F
d
E
b Ordovician d
Carboniferous e Permian
f Triassic
Describe and identify the major geological
structures shown on the cross section above
18
Lake District 1250,000 Sheet 54N - 04 West
Solid
Permian
Ordovician
Carboniferous
Describe the likely nature of these igneous
intrusions
Identify 2 unconformities on the map
extract
Silurian
19
Lake District 1250,000 Sheet 54N - 04 West
Solid
Carboniferous
Silurian
Permian
Shap Granite
Ordovician
Ordovician
Identify 2 unconformities on the cross section
above, use
information from the previous slide to help you
20
Monmouth 150,000 Sheet 233 Solid Drift
B
A
D
Note-basal conglomerate
G
H
Describe and identify the major fold structure
along line G H on the map extract
C
Identify the structures shown in boxes A, B, C
and D
21
The Roaches Upper Dove Valley 125,000 Sheet
SK06 Solid Drift
Identify the major fold structure in the box
above, refer to strike, dip,
symmetry and plunge where appropriate
22
The Roaches Upper Dove Valley 125,000 Sheet
SK06 Solid Drift
Landslide
Oldest bed
Describe and identify the major fold structure on
the extract above, refer to strike, dip,
symmetry and plunge where appropriate. Outline
the likely reason for the occurrence of the
large landslide on the map
23
Church Stretton 150,000 Sheet 166 Solid
Describe the major fold structure in the
highlighted box, refer to strike, dip, symmetry
and plunge where appropriate
Dolerite
Suggest, with reasons the likely form of the
dolerite intrusion on the extract
24
Millers Dale 125,000 Sheet 17 Solid Drift
Describe and identify the major fold structure on
the extract above, refer to strike, dip,
symmetry and plunge where appropriate
25
Bristol 1 inch1mile Solid Drift
Describe the relationship between beds f6 and d2
on the map extract
Identify the major fold structure in the box on
the map extract above
26
Bristol 1 inch1mile Solid Drift
Describe and identify the major fold structure in
this area of the map extract
27
Bristol 1 inch1mile Solid Drift
Describe and explain the nature of the faulting
in this area
Describe the relationship between the f6 Triassic
beds and the Carboniferous d1 to d3 beds on the
extract
Identify the major fold structure in this area
28
Pembroke Linney Head 150,000 Sheets 244/245
Solid Drift
P
Describe and identify the major fold
structures along line P Q Check your
answer on the next slide
Q
29
Pembroke Linney Head 150,000 Sheets 244/245
Solid Drift
Describe the major fold structures on the cross
section above. Suggest areas where beds are
likely to be overturned. What field evidence
could you look for to prove some limbs were
inverted?
30
Pembroke Linney Head 150,000 Sheets
244/245 Solid Drift
Identify and describe 2 major fold structures on
the map extract, refer to strike, dip,
symmetry and plunge where appropriate
31
Maidstone 1 inch1 mile Sheet 288 Solid Drift
J
Line of section on next slide
N
This fault plane dips S at 77 State the type of
fault
Check your answer on the next slide
K
32
Maidstone 1 inch1 mile Sheet 288 Solid Drift
How could you calculate the throw of the fault?
North
South
Reverse Fault
K
J
Hanging wall upthrown
Footwall downthrown
33
Lands End 1250,000 Sheet 50N 06W Solid
Describe and account for the shape of the
metamorphic aureole around the St. Austell granite
St.Austell Granite
Edge of metamorphic aureole
34
Describe the drainage pattern shown in the North
and Eastern part of the map
Maidstone 1 inch 1 mile Sheet 288 Solid Drift
35
Swansea 150,000 Solid Sheet 247
This fault plane dips WNW at 67, state the type
of fault
Identify the main fold structure, refer to dip
and strike, symmetry and plunge where appropriate
N
36
Swansea 150,000 Solid Sheet 247
Y
The Grovesend Fault dips East at 40
This fault dips west at 47
Identify this fault structure
Identify the structure between these 2 faults
X
37
Swansea 150,000 Solid Sheet 247
Describe the major fault structures on the cross
section below
Cross section along line X-Y on previous slide
38
Coventry 150,000 Solid Drift Sheet 169
A
Describe the strike and dip of the coal seams in
boxes A and B Account for the variation in
outcrop pattern of the coal seams in boxes A and
B on the map extract
B
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Coventry 150,000, Solid Drift Sheet 169
A
Describe the map evidence to support the idea
there is an angular unconformity within
highlighted box A on the extract above
40
Newton Abbot 150,000, Solid Drift Sheet 339
Granite
Describe and account for the drainage pattern
developed on the granite on the western side
of the map extract
41
Newton Abbot 150,000, Solid Drift Sheet 339
Dolerite
What type of intrusion is represented by the
dolerite?
Granite
m metamorphic aureole
Give 2 pieces of map evidence to show that the
granite intrusion is younger
than the dolerite on the extract above
42
Newton Abbot 150,000, Solid Drift Sheet 339
Dolerite
75
A
Black Shales
A major quarry is located in box A above. Outline
2 problems that the local geology may present to
the quarrying activity.
43
Newton Abbot 150,000, Solid Drift Sheet 339
State the map evidence for these beds being
horizontal
Impermeable Breccia
Landslip
Permeable Sandstone
Periglacial Head Gravel-Permeable
Outline the factors that may explain the
formation of the landslip shown
on the extract above
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The End