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E. REFLECT & DISCUSS What geologic event occurred during the Mesozoic Era in the region where Fig. 8.6 is located? Explain.

E. REFLECT & DISCUSS What geologic event occurred during the Mesozoic Era in the region where Fig. 8.6 is located? Explain.

Applications and Investigations in Earth Science (9th Edition)
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
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E. REFLECT & DISCUSS What geologic event occurred during the Mesozoic Era in the region where Fig. 8.6 is located? Explain.
Transcribed Image Text:E. REFLECT & DISCUSS What geologic event occurred during the Mesozoic Era in the region where Fig. 8.6 is located? Explain.
Figure 8.6 Angular unconformity. CHANNE F D C E B F We know that formations A-D have been subjected to deformation because they are tilted and not in their original horizontal orientation. The fossil evidence indicates that formation D is younger than C, which is younger than B. The contacts between formations A-D are all illustrated as conformable contacts formed by continuous sedimentation, so we use the principle of superposition to interpret formation A as the oldest in this set of formations. After tilting, the upper edges of formations A-D were eroded to form surface E. Formation F was deposited on erosional surface E, forming an angular unconformity with the tilted formations below E.
Transcribed Image Text:Figure 8.6 Angular unconformity. CHANNE F D C E B F We know that formations A-D have been subjected to deformation because they are tilted and not in their original horizontal orientation. The fossil evidence indicates that formation D is younger than C, which is younger than B. The contacts between formations A-D are all illustrated as conformable contacts formed by continuous sedimentation, so we use the principle of superposition to interpret formation A as the oldest in this set of formations. After tilting, the upper edges of formations A-D were eroded to form surface E. Formation F was deposited on erosional surface E, forming an angular unconformity with the tilted formations below E.
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