2-40.
2-35.
2-36.
2-37.
2-38.
2-39.
Learning Objective: Identify
the purpose, methods, and
requirements of geological and
pedological surveys.
The purpose of a geological survey
is to obtain which of the following
data?
1.
2.
3.
4.
To locate rock formations in
the field and determine their
physical characteristics
To determine rock age and
distribution
To determine the types of rocks
and their mineral content
All of the above
How can a geologist determine
the approximate age of a rock
formation?
1.
By examining the sequence
of rock units
2.
From data obtained by seismic
surveys
3.
By the presence of certain
organic particles
4.
From data obtained by nuclear
density surveys
Which of the following survey
methods might a geologist use in
plotting features on a field map?
1.
Reference an outcrop to
a relief feature
2.
Reference an outcrop by
establishing direction with
a compass
3.
Measure the difference in
elevation with an altimeter
4.
Each of the above
The surveyor supports the geologist
by performing which of the
following tasks?
1.
By examining the borehole
samples
2.
By plotting the results
of the geological surveys
3.
By preparing the basic
topographic map
4.
Both 2 and 3 above
To establish your base direction,
you should take which of the
following steps?
1.
Perform a triangulation survey
2.
Run a control traverse
3.
Begin from an established
monument
4.
Use an established base line
from a triangulation net
2-41.
2-42.
2-43.
2-44.
2-45.
2-46.
2-47.
Distance measurements should be
obtained as accurately as possible
for a base map survey.
1.
True
2.
False
Measurements made by stadia during
a geological survey must be
accurate to 1 part in
1.
200
2.
300
3.
500
4.
1,000
What is the maximum allowable error
in elevation when plotting data for
a geological map?
1.
One half of the contour
interval
2.
One contour interval
3.
Two contour intervals
4.
25 feet
Horizontal angles, other than
traverse angles, that are plotted
on a geological topography map
should be read to the nearest
1.
1 minute
2.
15 minutes
3.
30 minutes
4.
1 degree
Aerial photographs may be used in
place of a base map that will be
used for engineering purposes.
1.
True
2.
False
Which of the following topographic
features are more clearly shown on
aerial photographic maps?
1.
Intermittent streams
2.
Sinkholes
3.
Abrupt contour changes
4.
Heavily wooded swamp areas
The plotted elevations of the
intersection of core borings and
the surface of the earth should
be accurate to the nearest
1.
0.1 ft
2.
0.5 ft
3.
1.0 ft
4.
5.0 ft
Geological surveys should conform
to what degree of precision?
1.
First order
2.
Second order
3.
Third order
4.
Fourth order
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