Points Of Structural Measurements From Geological Mapping A 13.5 measuring geological structures. documenting the characteristics of geological structures is used to understand the geological history of a region. one of the key features to measure is the orientation, or attitude, of bedding. we know that sedimentary beds are deposited in horizontal layers, so if the layers are no longer horizontal, then. Measurement of geological features is done with a special compass that has a built in clinometer, which is a device for measuring vertical angles. an example of how this is done is shown on figure 12.19. figure 12.18 a depiction of the strike and dip of some tilted sedimentary beds partially covered with water.
Points Of Structural Measurements From Geological Mapping A Stereographic projection is a powerful method for solving geometric problems in structural geology. unlike structure contouring and other map based techniques, it preserves only the orientation of lines and planes with no ability to preserve position relationships. however, it is extremely useful, as orientation problems are very common in. On your projection label the angles corresponding to the trend and plunge. 2) construct the great circle representing the plane 120 50, and its pole. on the projection label the angles corresponding to the plane’s strike, dip and numerical dip direction. 3) plot the line of intersection of the planes 132 22 and 074 68. Structural geology. by the end of this workbook and associated exercises you should understand what a stereonet is, why they are used in structure geology and be confident in plotting, manipulating and interpreting data on a stereonet. the worksheet includes basic plotting exercises. those already confident with plotting data. The projection itself, or stereogram, is usually drawn on tracing paper, and represents a bowl shaped surface embedded in the earth. the stereographic net or stereonet is the 3 d equivalent of a protractor. it is used to measure angles on the projection. to measure angles, we need to rotate the net relative to the tracing paper.
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