Changes

* Choose a hill or high topography that extends

* Choose a hill or high topography that extends

* Pull the longitudinal direction of the hill or high topography as the direction of strike

* Pull the longitudinal direction of the hill or high topography as the direction of strike

* Directions of dip is determined by looking at the density of contour lines on both sides of the line of strike that has been withdrawn

* Directions of dip is determined by looking at the density of [[contour]] lines on both sides of the line of strike that has been withdrawn

* Directions of dip is parallel to the most tenuous density contour of both sides of the strike

* Directions of dip is parallel to the most tenuous density contour of both sides of the strike

To determine the litology that may compose each litological unit can be used several indicators, such as:

To determine the litology that may compose each litological unit can be used several indicators, such as:

* Different kind of vegetations, vegetation sometimes represents the difference of litology. For example teak trees usually grow above carbonate rocks. Although not usually true, but the data is quite useful as a first approximation.

* Different kind of vegetations, vegetation sometimes represents the difference of litology. For example teak trees usually grow above carbonate rocks. Although not usually true, but the data is quite useful as a first approximation.

* Roughness and fineness of the contour line patterns, contour line pattern may also indicate differences in litology. Dense contour line pattern indicates solid and hard rock such as metamorphic rocks, igneous rocks and sedimentary rocks that are resistant while the smooth contour line pattern indicates sedimentary rocks that are not resistant (e.g. mudstone).

* Roughness and fineness of the [[contour]] line patterns, contour line pattern may also indicate differences in litology. Dense contour line pattern indicates solid and hard rock such as metamorphic rocks, igneous rocks and sedimentary rocks that are resistant while the smooth contour line pattern indicates sedimentary rocks that are not resistant (e.g. mudstone).

In the tentative geological map we can also draw a lineament that estimate the geological structures such as faults. Fault is marked by the change of contour line patterns drastically or shifted in a narrow area. Estimated geological structure will facilitate observations in the field to look for evidence of the structure.

In the tentative geological map we can also draw a lineament that estimate the geological structures such as faults. Fault is marked by the change of contour line patterns drastically or shifted in a narrow area. Estimated geological structure will facilitate observations in the field to look for evidence of the structure.