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Line 35:
Line 35: − + − + − + − + − + − + − + − + − + − + − Determining the direction of strike and dip can be done by looking at the secondary data. The result of this determination is still tentative and should be checked in the field. Steps for determination of strike / dip of rock layers through a topographic map are as follows: − * Choose a hill or high topography that extends − * 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of dip is determined by looking at the density of [[contour]] lines on both sides of the line of strike that has been withdrawn − * Directions of dip is parallel to the most tenuous density contour of both sides of the strike − + + + + + +
→Pre-mapping stage
===Analysis of images and topographic maps===
===Analysis of images and topographic maps===
The initial step that should be done is secondary data collection. This data will be the basis for interpretation of pre-mapping. Required secondary data are:
The initial step that should be done is secondary data collection. This data will be the basis for interpretation of pre-mapping. Required secondary data are:
Topographic Map
* Topographic map
* Satellite Images
* Satellite images
* Regional Geological Map
* Regional geological map
* Landuse Map
* Land use map
* Paper or Journal about Geological Research in Area that will be mapped
* Geological research for area that will be mapped
* Geological Maps of mapping area that have been made (if available)
* Geological maps of mapping area (if available)
After all secondary data collected, analysis process can start. Aim of analysis process is to determine the following points:
After all secondary data collected, analysis process can start. The aim of the analysis process is to determine the following points:
* Landscape and [[Strike]]/[[dip]] of bedding
* Landscape and [[strike]]/[[dip]] of bedding
* Distribution of rock units/Formation
* Distribution of rock units or formations
* Geological Structure pattern
* Geological structure pattern
* Tentative maps
* Tentative maps
===How to interpret strike and dip of bedding rocks from images or topographic maps===
===How to interpret strike and dip of bedding rocks from images or topographic maps===
<gallery mode=packed heights=300px widths=300px>
<gallery mode=packed heights=300px widths=300px>
File:UGM_Mapping_Map_1.png
File:UGM_Mapping_Map_1.png
File:UGM_Mapping_Map_2.png
File:UGM_Mapping_Map_2.png
</gallery>
</gallery>
Determining the direction of strike and dip can be done by looking at the secondary data. The result of this determination is still tentative and should be checked in the field. Steps for determination of strike or dip of rock layers through a topographic map are as follows:
* Choose a hill or high topography that extends
* Pull the longitudinal direction of the hill or high topography as the direction of strike
* Direction of dip is determined by looking at the density of [[contour]] lines on both sides of the line of strike that has been withdrawn
* Direction of dip is parallel to the most tenuous density contour of both sides of the strike
===Make tentative geomorphological map===
===Make tentative geomorphological map===