Using the geologic map of Virginia, answer the following questions: Is the regio
ID: 106008 • Letter: U
Question
Using the geologic map of Virginia, answer the following questions: Is the region in the extreme northwest corner to the Potomac River strongly folded or strongly faulted? Is the region from the southeast corner to Harrison Island along the Potomac strongly folded or strongly faulted? In the southwestern part of the map, along the Shenandoah River, the sediments are only Quaternary in age, yet they are surrounded by much older Cambrian sediments. How do you explain this? In the southeastern corner of the map, locate Rockville and Gaithersburg. Notice that they are separated by the Plummer’s Island Fault. Is Rockville moving atop Gaithersburg or is Gaithersburg moving atop Rockville? Find Martinsburg, WV, in the extreme northwest corner. Now locate Martinsburg, MD, which is just to the to the east of Harrison Island and Mason Island along a bend in the Potomac in the south central area of the map. Which is surrounded by the older rock? Locate Long Marsh Run just south of the West Virginia/ Virginia border on the southwestern side of the map. Which way is it flowing? How many different ages of rock would you encounter along its course? In the middle image at the bottom, to the far right, you see that the younger Prettyboy Schist lies beneath the older Mather Gorge Formation. How can older rock be found atop younger rock? Locate the oval, brown rocks near the center of the map. What geologic feature is this?
Explanation / Answer
Using the official geologic map of Virginia from: https://mrdata.usgs.gov/geology/state/state.php?state=VA
How many different ages of rock would you encounter along its course? At least 4 different ages of rock
7. In the middle image at the bottom, to the far right, you see that the younger Prettyboy Schist lies beneath the older Mather Gorge Formation. How can older rock be found atop younger rock? The Prettyboy Schist lies beneath Mather Gorge Formation because this area is very active in terms of faults and folds and this formation is intruded by the Prettyboy Schist so we can find this schist beneath that Formation.
8. Locate the oval, brown rocks near the center of the map. What geologic feature is this? Could be dikes, stocks, or any kind of intrusion.
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