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Recitation
7:
Geologic
Histories
Introduction:
The
first
step
in
understanding
the
Earth
is
understanding
how
modern
systems
work.
The
second
step
is
to
use
the
rock
record
to
move
into
the
past.
Once
you
are
able
to
interpret
how
each
rock
type
formed,
you
need
to
be
able
to
put
each
geologic
event
that
produced
each
rock
unit
into
its
proper
sequence.
Goals:
1.
Learn
to
recognize
geologic
structures
and
erosional
unconformities.
2.
Understand
how
to
use
the
Principles
of
Superposition;
Lateral
Continuity;
Original
Horizontality;
and
Cross-
Cutting
Relations,
Inclusions,
and
Baked
Contacts
to
reconstruct
a
history
of
geologic
events.
Incorporate
your
understanding
of
the
forces
that
produce
geologic
structures
to
further
your
understanding
of
the
history
reflected
in
geologic
cross-sections.
4.
Incorporate
your
knowledge
of
how
igneous,
sedimentary,
and
metamorphic
rocks
form
to
fully
flesh
out
the
geologic
history
reflected
in
cross-sections.
Skills
Developed:
Geologic
histories
are
like
little
puzzles.
These
problems
help
you
to
make
and
assimilate
a
series
of
interrelated
observations
and
use
them
to
construct
a
geologic
narrative.
Part
A:
Geologic
Structures
1.
Examine
the
block
diagrams
below.
Determine
whether
each
fault
is
a
normal
fault,
reverse
fault,
or
strike-slip
fault
and
what
type
of
geologic
stress
formed
the
fault.
Draw
arrows
on
either
side
of
the
fault
to
indicate
the
direction
of
motion;
arrows
have
been
added
to
the
first
diagram
as
an
example.
Y
Fault
type:
Fault
type:
Fault
type:
SHewwe
S0P
Feotk
Poverste
NOrmat
Stress
that
formed
feature:
Stress
that
formed
feature:
Stress
that
formed
feature:
S
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COM
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Ot
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A
