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Science · Earth sciences
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: Evaluate the geology of the area selected for sourcing the facing stone

Task Questions
A geological map of the area selected to source Grey Fell Sandstone to be used in the construction of the sailing school is presented in Figure 4.1. Here, the geological unit A has been identified as the potential source.
a. List the geological units in chronological order and name and identify the main structural features in the geological map.
[15 Marks] for the chronological sequence
[15 Marks] for identifying the main structural features [30 Marks]
b. Draw structural contours for the geological Grey Fell Sandstone (unit A) and determine the strike, dip and dip direction of the layer.
[6 Marks] for the structural contours
[8 Marks] for determining strike
[8 Marks] for determining dip
[8 Marks] for determining dip direction [30 Marks]
c. Using structural contours and maintaining the same scale for vertical and horizontal axis, construct a geological cross-section along the X-Y intersect line. Using point Z as a reference, at what depth would you likely find Grey Fell sandstone (unit A)?
[25 Marks] for a properly drawn cross-section including important information
[5 Marks] for correct determination of depth [30 Marks]
d. Identify and describe the origin of unit C.
[10 Marks] for correct identification of unit C
[20 Marks] for describing unit C [30 Marks]
e. Core samples from unit D describe this unit to be limestone with various types of ammonites. Explain how this geological unit was formed.
[30 Marks] for properly explaining the origin of unit D

: Evaluate the geology of the area selected for sourcing the facing stone

Task Questions
A geological map of the area selected to source Grey Fell Sandstone to be used in the construction of the sailing school is presented in Figure 4.1. Here, the geological unit A has been identified as the potential source.
a. List the geological units in chronological order and name and identify the main structural features in the geological map.
[15 Marks] for the chronological sequence
[15 Marks] for identifying the main structural features [30 Marks]
b. Draw structural contours for the geological Grey Fell Sandstone (unit A) and determine the strike, dip and dip direction of the layer.
[6 Marks] for the structural contours
[8 Marks] for determining strike
[8 Marks] for determining dip
[8 Marks] for determining dip direction [30 Marks]
c. Using structural contours and maintaining the same scale for vertical and horizontal axis, construct a geological cross-section along the X-Y intersect line. Using point Z as a reference, at what depth would you likely find Grey Fell sandstone (unit A)?
[25 Marks] for a properly drawn cross-section including important information
[5 Marks] for correct determination of depth [30 Marks]
d. Identify and describe the origin of unit C.
[10 Marks] for correct identification of unit C
[20 Marks] for describing unit C [30 Marks]
e. Core samples from unit D describe this unit to be limestone with various types of ammonites. Explain how this geological unit was formed.
[30 Marks] for properly explaining the origin of unit D [30 Marks]

500 475 -425_ ~ ~ -375 375 Legend: 50m

Answer
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