Lab 3 intro crosssection

Lab 3 intro crosssection - GEOS 304 LAB 3 Spring, 2010...

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GEOS 304 – LAB 3 Name:_____________________ Spring, 2010 Introduction to Map Interpretation and Geologic Cross-sections Part I. Map Interpretation (20 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. 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? (6 pts) 2. 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. (5 pts) 3. Large faults have greater stratigraphic offset (age difference of the oldest rock in hanging wall and the youngest rock in footwall) than small faults. For example, a
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Lab 3 intro crosssection - GEOS 304 LAB 3 Spring, 2010...

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