Dip and strike of the formations are generally marked on geological maps by the symbols shown in Figure 1.

The amount of dip, in degrees, is generally added to the symbol in order to have an exact record on the map of all the field observations.

In case there are very many dip symbols on a map, the figures of degrees do not permit a clear picture of the tectonic conditions at a glance. Symbols without the figures of degrees may be arranged nicely with their short strike lines, giving the impression of contour lines. This is especially the...

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