Bear in mind that geologic contacts are different than topographic contours. In many cases the contacts ignore the topography altogether. Recall from lecture that strike and dip refers to the attitude of rock layers. The strike is an imaginary line where a rock unit intersects a horizontal plane at the surface of the outcrop. Its purpose is to show the trend of a particular part of rock unit across the surface of the Earth.
Strike is represented by a compass direction.
The strike often closely parallels the contact between different rock units. Strike and dip symbols look like short T s . They are placed on the map view only. Part A. Tilted Rocks . Tilted rocks are the simplest form of geologic structure .