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WalesGeologyQuick questions
G2: Rock Deformation
Quick questions on Tectonic structures and mountain building - WJEC A-Level Geology
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What are structures of mountain belts?Show answer
Mountain building (orogeny) at convergent margins produces the most intense structures: tight, overturned and recumbent folds, stacked thrust faults, and nappes (large recumbent fold-and-thrust sheets transported many kilometres). These stack and thicken the crust, and later uplift and erosion expose the deep structure.
What are reconstructing the sequence of events?Show answer
The deformation dating principles let you order events:
What is q1?Show answer
Name the three types of unconformity and state what lies below the surface in each. [3 marks]
What is q2?Show answer
State the sequence of events recorded by an angular unconformity. [2 marks]
What is q3?Show answer
A dyke cuts a folded sequence. State which is younger and the principle used. [2 marks]
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