Question 3 – Map 22 in the textbook – Please print out. (14 marks)
Take a good look at the map first. How can you tell that the area is folded? The two faults labelled
F1 and F2 are normal faults and we can assume a dip of 85° and a throw of 100 m—can we tell, from
the map view, which are the footwall and hanging-wall blocks?
a) Construct the cross-section X-Y using the profile provided. Use your stereonet to derive any
apparent dips that you need. Note that to the SE of fault F2 we only need to draw the coal seam,
not the units below. (6 marks)
b) There are seven (7) units depicted on the map; note that the ‘white’ unit containing the coal
seam is considered as one unit. Complete the Legend provided by filling-in the patterns used on
the map, from oldest at the base to youngest at the top. Number the units simply to facilitate
referring to them in the sequence of events [see below]. (3.5 marks)
c) Complete the sequence of geologic events based on the map; 8 or 9 events should be sufficient.
Consider the deposition of successive units, not separated by major/obvious unconformities, as a
single event. (4.5 marks)
Sample Solution