In this view of the face of the compass the red arrow shows the strike of a laye
ID: 287375 • Letter: I
Question
In this view of the face of the compass the red arrow shows the strike of a layer of sandstone. What is that direction?
North 30o East
It is impossible to tell from this view
North 330 degrees east
North 30o West.
Two possible dip directions are possible based on the image in the previous question. They are:
It is impossible to tell without seeing the actual rock units.
Nearly N or S
North 30 degrees east
Roughly SW or NE
North 30o East
It is impossible to tell from this view
North 330 degrees east
North 30o West.
8 ! =1 NO-Nnua On anExplanation / Answer
1. The red arrow shows the strike of a layer of a sandstone. The direction is North 300 east.
The North point of the compass indicates 3300 and the strike direction of the sandstone bed makes an angle of 300 eastwards to the north. Therefore, in the view of the face of the compass the strike direction is N300E, but actually the bed strike is 00 - 1800 means the bed is horizontal.
2. It is impossible to tell without seeing the actual rock units.
Dip direction is always perpendicular to the strike. Therefore if the bed strike is 00 -1800, the dip direction would be 900/ 2700 i.e. East or Westwards.
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