During a field trip with your geology class you visit an exposure of rock layers similar to the one sketched below. A fellow student suggests that the layer of basalt is a sill. Do you agree or disagree? Explain why you think the layer is a sill OR why you disagree with this student. Write a likely explanation for the geologic history of these layers to support your stance.
During a field trip with your geology class you visit an exposure of rock layers similar to the one sketched below. A fellow student suggests that the layer of basalt is a sill. Do you agree or disagree? Explain why you think the layer is a sill OR why you disagree with this student. Write a likely explanation for the geologic history of these layers to support your stance.
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Question
During a field trip with your geology class you visit an exposure of rock layers similar to the one sketched below. A fellow student suggests that the layer of basalt is a sill. Do you agree or disagree? Explain why you think the layer is a sill OR why you disagree with this student. Write a likely explanation for the geologic history of these layers to support your stance.
Transcribed Image Text:Shale
Vesicles
Basalt
Sandstone
Shale
Limestone
© 2012 Pearson Education, Inc.
Expert Solution
Step 1
A sill is a tabular concordant igneous body that cuts across older sedimentary rock layers. It is concordant, which means that it is parallel to the sedimentary rock above and below it and does not cut across them. A sill generally forms in the direction of pro-grading metamorphism.
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