Part I. Map Interpretation (25 pts): Famous USGS geologist Melvin Mudge produced

Question

Part I. Map Interpretation (25 pts): Famous USGS geologist Melvin Mudge produced a geologic map and cross section of an area in western Montana, south of Glacier National Park. We will use his map and cross section to begin to learn how to interpret geologic maps. 1. (6 pts) Why did Mel choose to draw his cross section along a line oriented ENE- wsW? How many types of structures would show up in a NNW-SSE cross section, perpendicular to the one Mel chose? Why is a cross section useful in interpreting the geologic structure of the area? 2. (5 pts) It is possible to determine the relative dips of faults using only map patterns. Which fault dips more steeply, the Glenn Fault or the Renshaw Thrust? Explain how to obtain this information from the map.

Explanation / Answer

1. Melvin Mudge decided to draw a cross-section along ENE-- WSW direction because the maximum number of geological and topogfraphical features are found along this direction when we traverse across this direction in the area.

A cross section is useful in interpreting a geological map as it shows a clear relationship between the structural and stratigraphic units and cross-sections. They are so important because they appear as if the area has been cut open. Like in mountainous areas and canyons, the area is seen like in the cross section.

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