Infer
Geologic
History
.
e
from
a
New
Mexico
Outcrop
Activity
8.5
Name:
Course/Section:
Date:
Lea
fflil’lg
GOAL
You
will
apply
both
relative
and
numerical
dating
techniques
to
interpret
the
sequence
of
geologic
events
from
structures
exposed
in
a
coal
mine
A
Refer
to
Fig.
AB.5.1,
which
shows
an
outcrop
in
a
surface
coal
mine
in
northern
New
Mexico.
Note
the
sill,
sedimentary
rocks,
fault,
places
where
a
fossil
leaf
was
found, and isotope
data
for
a
specimen
of
the
basalt
sill
1.
What
are
the
ages
of
the
three
rock
layers
in
this
outcrop
relative
to
each
other?
Explain
your
reasoning.
2.
What
is
the
numerical
age
of
the
sill?
Use
the
information
in
Fig.
8.14.
and
show
how
you
calculated
the
answer
3.
Locate
the
fault.
Approximately
how
much
separation
has
occurred
along
this
fagh?
_
m
What
additional
information
would
you
like
to
have
to
make
a
better
estimage
of
fault
separation?
Figure
A85.1
227
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