3 13 4. In the map above, which way is the stream (dashed line) flowing? Contact
ID: 118557 • Letter: 3
Question
3 13 4. In the map above, which way is the stream (dashed line) flowing? Contacts between units 1, 2, 3 & 4 are shown with bold lines. By looking at the outcrop patterns of these contacts, describe how you think these beds are dipping: Contact between Unit 3 & Unit 4: Contact between Unit 2 & Unit 3: Contact between Unit 1 & Unit 2: Using the three point method, calculate the strike and dip of the contact between Units 1 & 2. Show your work. Compare this to what you originally thought the attitude of the beds would be Name the structure these beds represent:Explanation / Answer
4. The contour on the extreme right is of 1200 value which is decreasing towards the left and since river is always flowing from contour of higher elevation to lower elevation hence it is flowing towards right to left on the dashed line.
Contact between unit 3 and unit 4: Since the 4 unit is not shown, hence taking the horizontal continuity and assuming the 4 unit is on the left of 3 we can say that the contact between 3 and 4 can be depositional and hence a Paraconformity exist between 3 and 4.
Contact between unit 2 and unit 3: Between these two units there are chances that a Disconformity exist.
Contact between unit 1 and unit 2: Fault contact exist between 1 and 2.
For three point methoids we need the horizontal distance between and two contour level, which is calculated by using the scale given in the figure and since the scale is not given hence dip cannot be calculated by without scale.
The structure these beds represent is a valley sloping towards the left.
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