Question

A bedding plane, pictorially represented at X, will be plotted in stereonet as 

• A. I
• B. II
• C. III
• D. IV

Hint:

Stereonet projections are used to represent the orientation of planes and lines in 3D space. The dip and dip direction are crucial for accurate plotting.

Answer 1

The Correct Option is C

Analyzing the stereographic projection:

Given information:

• A bedding plane is shown pictorially at X (dipping toward the NW)
• The stereonet shows four possible great circles (I, II, III, IV)
• We need to identify which great circle represents the bedding plane X

Understanding the pictorial representation: The bedding plane at X:

• Has a strike line oriented approximately NE-SW
• Dips toward the NW (the plane slopes down to the northwest)
• The dip direction appears to be roughly toward 315° (NW)

Reading the stereonet: On a stereonet:

• The perimeter represents horizontal planes
• Great circles represent inclined planes
• The pole (perpendicular to the plane) plots at the top of the great circle for planes dipping away from north

Analyzing each great circle:

(A) I: Great circle dips gently, with pole plotting near the top (N). This represents a plane dipping southward - doesn't match

(B) II: Great circle shows moderate dip, pole toward north side - represents plane dipping southward - doesn't match

(C) III: Great circle shows steeper dip, oriented NE-SW, with the deepest part toward the NW quadrant. This matches a plane striking NE-SW and dipping NW - MATCHES

(D) IV: Great circle near the edge, representing nearly vertical plane - doesn't match

Answer: (C) III