Steven Dutch, Natural and Applied Sciences,
University of Wisconsin  Green Bay
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This is a very simple problem if we recall that structure contours are always parallel and equally spaced. The other structure contours will be parallel to our given contour, so the only real problem is to find the dip.
To determine the dip of the bed, we need to draw a line through the additional point (P) and perpendicular to the structure contour. There are two ways of doing this: 1. Use a right angle like the corner of an index card or a draftsman's triangle to draw the perpendicular. 2. Use a compass:

1. Find the strike and dip of the limestone layer from the data at left. 2. Find the dip either by drawing a crosssection or by trigonometry. 3. With the dip known, find the map spacing between contours using either crosssection or trigonometry. 4. Construct other contours parallel to the known contour and with the correct spacing. 
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Created 5 January 1999, Last Update 30 January 2012
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