1) Basic interpretation of geological maps and comparisons with actual field
observations to determine :
Dips , strikes and true & vertical thickness of beds, with reference to
scales and cross sections.
Identify different structures and faults.
Relate lithologies and structures to the overall topography of the area.
2) Identify and classify various siliciclastic, carbonate sediments and evaporites to deduce sources and depositional environments.
3) Identify fossils and study features that show their life styles and habitats.
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Maps
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|
| Q1 |
If we were at grid reference
868795 ,where would we be and what rock would we be standing on?
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| Q2 |
How far to Mupe Rocks?
|
| Q2a |
What general trends are
there for rock outcrops? (Dip, strike, patterns)
|
| Q3 |
In the Worbarrow Bay area
what is the actual dip?
|
| Q4 |
What is the relationship
between
i) the dip and relative age of rocks that outcrop here? ii) the dip and strike? iii) the width of the outcrops and the dips in Portland and Purbeck members? |
| Q5 |
Is this infallible ; what
about the Wealden member?
Looking eastwards, what about the narrow outcrop of Portland Sand at St Aldehm's Head head? Or the wider outcrops of the succeeding Portland Stone / Lower Purbeck members? |
| Q6 |
What is the relationship
of these outcrops to the contour lines?
Now have a look at the cross sections 1 & 2 - do they confirm our deductions? |
| Q7 |
Why are the dips in the
cross section 1 almost double what is shown on the map?
Now look at the real geology of the area and the regional setting. Estimate the thickness of the Wealden member. |
| Q8 |
How could you calculate
the true thickness, just from the map?
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| Q9 |
Describe what is happening
to the beds from Swanage to Mupe Rocks.
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| Q10 |
From the map and observations
of high/low ground what can you generalise about the properties of the
different outcrops.
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| Q11 |
From the outcrop patterns
and dips, what geological structure could we have in this area and what
is the relative age of the events causing it.
|
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Not much faulting
in the area , but look at the biggish one in Swanage
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|
| Q12 |
On which side of the fault
are the younger beds.
|
| Q13 |
What could the relative
movement be. What type of fault is it?
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| Q14 |
What is relative age of
the fault.
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| Q15 |
Couple of other bits from
the map.- what feature can you see at grid ref 922824
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| Q16 |
What can you generalise
about the V shape outcrops over at St Aldhem's in relation to direction
and angle of dips?
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Sedimentary
Rock Types
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| Q17 |
What are the 3 main minerals
making up sedimentary rocks.
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Carbonates
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|
| Q18 |
What is the most common
mineral?
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| Q19 |
What is its polymorph,
secreted by seashells?
|
| Q20 |
What are the 2 origins
of Limestone?
|
| Q21 |
Why does it fizz with
hydrochloric acid?
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| Q22 |
When doesn't a limestone
fizz?
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| Q23 |
How does limestone chemically
weather when exposed?
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| Q24 |
Limestones can be described
by 3 grain types and 2 intergranular - materials what are they?
Grains 1) 2) 3) Matrix 1) 2) |
| Q25 |
In what circumstances
will the 3 grain types accumulate.
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Mudstones
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|
| Q26 |
What are the main mineral
constituents.
|
| Q27 |
What are their origins.
|
| Q28 |
Why are higher current
speeds required to return them to suspension.
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Sandstones
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|
| Q29 |
What are their main mineral
constituents.
|
| Q30 |
What are their origins.
|
| Q31 |
Draw a diagram showing
how to classify sedimentary rocks by their mineral composition.
|
| Q32 |
What are the most common
cements of sedimentary rock?
|
| Q33 |
What are their origins?
|
| Q34 |
Comparable grain sizes
for classification of sandstones
|
| Q35 |
What 2 types of weathering
are there? Where are each most intensive and why?
|
| Q36 |
What are the weathering
products of the following minerals and what sort of structure do they
have in terms of silicate tetrahedra :
Mineral Product Silicate structure Olivine Pyroxine Amphibole Mica Feldspar Quartz |
| Q37 |
Which minerals generally
indicate a mature sediment?
|
| Q38 |
What properties do we
look at in classifying sandstones?
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| Q39 |
How would you define a
Greywacke?
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Flow Regimes and Structures
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|
| Q40 |
How would you define an
Arkose?
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| Q41 |
What flow rate produces
Laminar Cross Bedding Trough Cross Bedding Herring Bone Cross Bedding |
| Q42 |
Generally, what properties
determine ripples caused by current and wave action.
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Evaporites
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|
| Q43 |
What are the 3 most abundant
in Worbarrow bay.
|
| Q44 |
Why does volume change
accompany a change from one calcium sulphate to another.
|
| Q45 |
What are the main constituents
of :
Chert Chalk Greensand |
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Fossils
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|
| Q46 |
What are their uses?
|
| Q47 |
What makes for a good
zone fossil?
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| Q48 |
What conditions makes
for good preservation and where is this most likely to occur?
|
| Q49 |
Draw / describe the main
features of 2 types of invertebrate fossils you have seen today that give
some indication to their lifestyle, feeding habits and locomotion.
|
| Q50 |
Describe the geology and
environment over time from Late Jurassic to present day in the Worbarrow
bay area, including at least one unconformity.
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