ASBOG EXAM REVIEW PRACTICE QUESTIONS WITH
CORRECT ANSWERS.
1. What does it mean when you have topographic contours on a 1:24,000 scale
base map that are roughly circular and have hachures on the counters -
Answer- They represent a closed depression
2. You have a base map at a scale of 1:6,000 and you need to represent
the information you obtained during a field investigation of a site that is
one square mile, that included mapping of your site as well as subsurface
exploration results. What do you need to do to the map to make it work?: Use
a larger scale map because it covers a smaller area
3. If you have a map that is at a scale of 1:24,000 and you want to draw a cross
section with a 10 times exaggeration, what will the vertical scale be?: 1" = 200'
4. What is the approximate exaggerated dip if the vertical scale is exaggerated
10 times and the true dip is 30*?: 80*
5. What do you do if you have forgotten to research the current magnetic
declination before you go to the field to investigate and map a site for a
geologic mapping project?: Align your map with two planimetric features and
measure the declination with your compasss.
6. Location and elevation input into your GIS program comes from your GPS
system. The maps generated by this system are based on a reference datum.
If the maps were created in 1972, what do you need to do to use them with
the data output from your GPS system?: Make the conversion from NAD27 to
NAD83.
7. For a strike and dip of N25*E, 15*N, what is the attitude of the bed in terms
of the azimuth?: 205, 15
8. MAP NEEDED PAGE 3: What is the strike and dip of the bed?: N70*W, 38*NE
9. MAP NEEDED PAGE 3: What apparent dip would you expect to find along a
trench that is perpendicular to cross section A-A'?: 26*
10. The top of Unit A is found at location X at the ground surface and is
dipping 40* to the west. The slope is 20* to the east. Unit B is 75 feet thick,
is conformable with and below Unit A. The slope distance from the outcrop at
the top of Unit A at location X to the outcrop of the top of Unit B is 173 feet.
Unit B is a unit where you would expect a lot of lost circulation when drilling.
, The top of unit B is found at a depth of 195 feet. What is the thickness of Unit
A?: 150 feet
11. MAP NEEDED PAGE 4: What geologic law is used to determine the relative
ages of the faults?: Law of Cross-Cutting relationships
12. MAP NEEDED PAGE 4: There is a synclinal axis downslope of Unit B. Which
direction is the slope facing? Is it steep?.: NW and moderately sloping
13. MAP NEEDED PAGE 4: What is the youngest continuously deposited bed
found on the map?: Unit D
CORRECT ANSWERS.
1. What does it mean when you have topographic contours on a 1:24,000 scale
base map that are roughly circular and have hachures on the counters -
Answer- They represent a closed depression
2. You have a base map at a scale of 1:6,000 and you need to represent
the information you obtained during a field investigation of a site that is
one square mile, that included mapping of your site as well as subsurface
exploration results. What do you need to do to the map to make it work?: Use
a larger scale map because it covers a smaller area
3. If you have a map that is at a scale of 1:24,000 and you want to draw a cross
section with a 10 times exaggeration, what will the vertical scale be?: 1" = 200'
4. What is the approximate exaggerated dip if the vertical scale is exaggerated
10 times and the true dip is 30*?: 80*
5. What do you do if you have forgotten to research the current magnetic
declination before you go to the field to investigate and map a site for a
geologic mapping project?: Align your map with two planimetric features and
measure the declination with your compasss.
6. Location and elevation input into your GIS program comes from your GPS
system. The maps generated by this system are based on a reference datum.
If the maps were created in 1972, what do you need to do to use them with
the data output from your GPS system?: Make the conversion from NAD27 to
NAD83.
7. For a strike and dip of N25*E, 15*N, what is the attitude of the bed in terms
of the azimuth?: 205, 15
8. MAP NEEDED PAGE 3: What is the strike and dip of the bed?: N70*W, 38*NE
9. MAP NEEDED PAGE 3: What apparent dip would you expect to find along a
trench that is perpendicular to cross section A-A'?: 26*
10. The top of Unit A is found at location X at the ground surface and is
dipping 40* to the west. The slope is 20* to the east. Unit B is 75 feet thick,
is conformable with and below Unit A. The slope distance from the outcrop at
the top of Unit A at location X to the outcrop of the top of Unit B is 173 feet.
Unit B is a unit where you would expect a lot of lost circulation when drilling.
, The top of unit B is found at a depth of 195 feet. What is the thickness of Unit
A?: 150 feet
11. MAP NEEDED PAGE 4: What geologic law is used to determine the relative
ages of the faults?: Law of Cross-Cutting relationships
12. MAP NEEDED PAGE 4: There is a synclinal axis downslope of Unit B. Which
direction is the slope facing? Is it steep?.: NW and moderately sloping
13. MAP NEEDED PAGE 4: What is the youngest continuously deposited bed
found on the map?: Unit D
