A Geologist Is Working in an Area of Old Volcanic

question 54

Multiple Choice

A geologist is working in an area of old volcanic rocks exposed by erosion.He finds a large rock outcrop that contains flat lying gravels in the base of the outcrop.These gravels are overlain by basalt that forms a series of layers representing flows.The uppermost basalt lava flows have a dip of about 10 degrees to the west.What does this outcrop record?

• A)Basalt flows formed above a series of gravels,filling a river valley.
• B)Basalt flows formed after gravels were deposited,covered the local terrain,and built a shield volcano with dips of about 10 degrees.
• C)Gravels were initially deposited in a river valley and a cinder cone was erupted,damming the valley,before a cinder cone formed.
• D)You can't tell anything about the history of this region from this outcrop.

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