Geology: Understanding Folds

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Questions and Answers

What is the defining characteristic of a recumbent fold?

  • It is a secondary structure in folded rocks
  • It has undergone 180 degrees rotation
  • It is a partially overturned fold (correct)
  • It has straight limbs and sharp hinges

What distinguishes domes from basins?

  • Domes are semi-spherical, basins are semi-ellipsoidal
  • Domes have older rock layers in the center, basins have younger rock layers in the center (correct)
  • Domes have the youngest rock layers on the outer limbs, basins have the youngest rock layers in the center
  • Basins are typically represented by concentric rings, domes are not

What type of stress typically leads to the formation of chevron folds?

  • Compressive stress (correct)
  • Tensile stress
  • Normal stress
  • Shear stress

What distinguishes ptygmatic folds from disharmonic folds?

<p>Ptygmatic folds are regular in shape, disharmonic folds are irregular in shape (A)</p> Signup and view all the answers

In a folded rock structure, what are parasitic folds?

<p>Small asymmetric structures that form within large folds (D)</p> Signup and view all the answers

What causes plunging folds to form?

<p>Compression in more than one direction (D)</p> Signup and view all the answers

Which criterion is used to classify the tightness of folding?

<p>Size of the angle between the limbs of the folds (A)</p> Signup and view all the answers

What is the defining characteristic of a dome?

<p>Concentric rings of rock layers (C)</p> Signup and view all the answers

What feature distinguishes chevron folds from other types of folds?

<p>Zig-zag pattern (B)</p> Signup and view all the answers

Why do ptygmatic folds appear chaotic and disjointed?

<p>Greater viscosity than surrounding material (A)</p> Signup and view all the answers

What causes basins to appear as deep rounded depressions?

<p>Formation from intersecting synclines (C)</p> Signup and view all the answers

In what type of fold do parasitic folds form?

<p>Recumbent fold (A)</p> Signup and view all the answers

What type of rock layers typically cause the formation of chevron folds?

<p>Alternating rock layers of different compositions (A)</p> Signup and view all the answers

Why do plunging folds have an inclined hinge?

<p>Application of compressional stress in more than one direction (C)</p> Signup and view all the answers

What distinguishes thickly-bedded rocks in terms of folding?

<p>Retain thickness during folding (A)</p> Signup and view all the answers

What classification criteria indicates isoclinal folds?

<p>Tightness of folding (B)</p> Signup and view all the answers

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