Folds “Mushroom fold” “Horizontal fold”

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Folds “Mushroom fold” “Horizontal fold” Rider Structural Geology 310 2012 GCHERMAN

Rider Structural Geology 310 2012 GCHERMAN

Rider Structural Geology 310 2012 GCHERMAN

Rider Structural Geology 310 2012 GCHERMAN

Rider Structural Geology 310 2012 GCHERMAN

A A’ Rider Structural Geology 310 2012 GCHERMAN

This view of the fold is the vertical cross-section Fold plunges about 18o, therefore, cos 18 = .95 Fold-profile plane A’ 18o Vertical, cross-section plane Fold axis The profile view of the fold is looking down the fold plunge into the profile plane (90o to the plunge) A A’ Object grouped and scaled 95% in the vertical dimension Rider Structural Geology 310 2012 GCHERMAN

Name: Symbols: 60 Rider Structural Geology 310 2012 GCHERMAN

Name: Symbols: 60 0.8 Tight, steeply-inclined, gently-plunging anticline 1.8 1.2 18 28 0.6 Open, upright, gently-plunging syncline 1.8 75o 90o Width of unit A = 0.8 @ 52o Actual thickness : sin 52 = x / 0.8 = 0.63 Plunge: TAN X = 0.63 / 1.2 = 28o 18o 60o Profile 0.6 ILA = 76o ILA = 30o Profile Rider Structural Geology 310 2012 GCHERMAN

Rider Structural Geology 310 2012 GCHERMAN

EXPLANATION: Anticline Syncline O - outlier I - inlier D – depression C - culmination D O C O Rider Structural Geology 310 2012 GCHERMAN

Rider Structural Geology 310 2012 GCHERMAN

Explanation: Hinge point Structure contours for a limb Use the structure contours to figure out the limb dip, which is the same dip value for all limbs, Rider Structural Geology 310 2012 GCHERMAN

Name: Rider Structural Geology 310 2012 GCHERMAN

Name: z Y X z 260 Thickness: SIN 22 = z / 150 = 56 m 150 22o WISP FELL Open, steeply inclined, horizontal anticline Open, steeply inclined, horizontal syncline 44 20 Dip: TAN X = 20 / 40 = 26o