to) look at the block diagram and the geologic map in Figure 15,.23. What is the
ID: 118121 • Letter: T
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to) look at the block diagram and the geologic map in Figure 15,.23. What is the relationship between a horizontal contact on this map as a dendritic pattern, because it resembles the veins of a leaf. Course: and a contour line-parallel, perpendicular, or oblique. Keeping in mind the definition of a contour line, explain why Geologists refer to the arangement of valleys (b) The black stripe is a vertical basalt dike. Remember that when you are looking at a map, you are looking straight down from the sky. With this in mind, explain why the dike appears as a straight line on the map. FIGURE 15.23 Map pattern of horizontal strata in a valley Dike Contour -Contact Stream 5.5 Structures Revealed in Landscapes Unless you live in the Great Plains or along the Gulf Coast of the United States, you know that landscapes tend not to be as flat as the tops of the idealized block diagrams that we've worked with so far. In many cases, the distribution of rock units controls the details of the landscape, so erosion may cause structures to stand out in the landscape, especially in drier climates. For example, in regions of fl resistant rocks form cliffs, whereas nonresistant rocks form gentler slo at-lying strata, pes. Thus, CHAPTER 15 INTERPRETING GEOLOGIC STRUCTURESExplanation / Answer
a. As can be seen in the diagram the relationship between the horizontal contact and the contour line is oblique because it is at an angle to the horizontal contact line.
b. The dike is the discordant feature that cuts through another rock. It intrudes between open spaces in the preexisting rock. Dikes are generally vertical structure. Since the dikes are vertical it cuts a straight line on the map irrespective of the topography.
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