Student Name: Grade:
1.
Observations of the Bluff Rocks and Terrace Deposits:
a) List the geologic names, ages, and rock types for the
major rock formations making up the
stratigraphic
package exposed in the bluff.
Formation Name
Age (m.y) Rock Type(s) Depositional Setting
1)
2)
b) What is the
structural thickness and orientation of these layered sedimentary units?
1) Thickness: ______________________ Orientation: __________________
2)
Thickness: ______________________
Orientation: __________________
3) Thickness:
______________________ Orientation:
__________________
c) Compare the
present day depositional settings of this area with that of the bluff rock
units.
d) What was the
regional tectonic setting of
e) Describe the texture and composition of the rock
that makes up the dark-colored dike
Texture:
__________________________
Composition:
_______________________
f) Name the specific
rock type that makes up the dike:
_____________________
g) What is the age
of this igneous intrusion? Numeric: ________M.Y. Epoch:
_____________
h) What is the
structural dimensions and orientation of this igneous intrusion?
Dimensions:
______________________ Orientation:
__________________
i) What was the
regional tectonic setting in SD when this dike intruded the sedimentary units?
k) Has the tectonic setting of
2. Observations of
Present-day Weathering and Erosion of the Bluffs:
a) Is there evidence
of active weathering and erosion occurring on the bluff? Yes? No?
b) List the sorts of
weathering processes that are breaking down the bluff rocks.
1) ________________ 2) ___________________ 3) ____________________
c) List the sorts of
erosion that are recently removing and transporting the bluff material.
1) ________________ 2) ___________________ 3) ____________________
d) Observe any mass
wasting features? Landslides?
Slumps? Flows? Briefly Describe
e) Observe any bluff
material infringing and/or mingling with the beach deposits. Yes? No?
f) Based on your
observations. do you think that the bluffs are a
significant source of sand for
the
beach? Yes? No?
3. Observations of
Tectonic Activity and Seismic Risks at
a) Name the major
active fault that runs under Mt. Soledad, La Jolla Shores, and offshore.
__________________________
Note: It runs from Southeast to
Northwest with a left “kink”.
b) What kind of fault is it? _______________________________
c) What sort of
earthquake magnitude and frequency is this fault capable of?
Maximum magnitude ______ Frequency of “Big Ones” ______________
d) Name the
e) Name and describe
at least one fault-related structure that you can observe.
f) Has there been any recent land movement that may be related
to the tectonic activity of this
area? If so, where and what sort of earth movement?
g) Is the left-jogging ”kink” in the RCF the likely cause of the uplift of
4.
Discussion of Local Tsunami Hazard
a) What factors make
this stretch of coastline most vulnerable to tsunami?
1)
2)
3)
b) Briefly describe
the most likely scenario for the local generation of a tsunami.
c) What is the estimated max size and warning time of a
locally generated tsunami that could
strike
this beach?
d) What other natural hazard related
to locally generated tsunamis poses a major
threat to the
e) Describe what you’d see right before a
tsunami was to hit our shore? What would you do?
B. Post Trip Reflection
Each student must write a lab
reflection (minimum of 120 words in length) about your experience in doing the
exercises in the field lab today.
Include the following: 1) The central purpose of this fieldtrip; 2) What
was the most important thing that you learned from doing this excursion? 3) What
was the most interesting aspect of the lab? 4) What was the biggest problem or
challenge that you encountered while doing this lab? 5) Provide some
constructive criticism of the fieldtrip design.
Hand write (if you’re neat) or type.
1) Purpose
of lab: _________________________________________________________________
_______________________________________________________________________________
2) What actually
learned? __________________________________________________________
_______________________________________________________________________________
3) Most
interesting aspect(s)? ______________________________________________________
_______________________________________________________________________________
4) Most
difficult or challenging aspect(s)? _____________________________________________
_______________________________________________________________________________
5) Thoughts
on trip design and execution ______________________________________________
_______________________________________________________________________________
______________________________________________________________________________