Source tom bean younger older folded rock before

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Unformatted text preview: Tom Bean Younger Older Folded Rock Before Erosion Folded Folded Rock After Erosion Folded Eroded Anticline, older rocks in center. Syncline is opposite. Topography may be opposite of Structure Anticline Before/After Erosion Anticline Notice center rock oldest Topography may be opposite of Structure Syncline Before/After Erosion Syncline Notice center rock youngest Various Folds Various Various Folds (cont'd) Various Various Folds (cont'd) Various Various Folds (cont'd) Various Axis Axial plane near axis should be close to horizontal Plunging Folds Plunging Demo: Plastic box, water, paper folds Up End Down End Nose of anticline points direction of plunge, syncline nose in opposite direction Plunging Folds Nosed folds, therefore plunging Source: GEOPIC©, Earth Satellite Corporation 3-D: Dome and Basin 3-D: Interpreting Folds Interpreting • Determine if center rocks are older or younger than flanks: fossils, right side up clues (graded bedding and mudcracks) • Are limbs parallel or “Nosed”? • Determine limb dips from measurements, stream V’s. Strike and Dip • Use nose rules for anticlines and synclines Fractures Fractures • • Fractures • - Joints: fractures with no relative movement • - Faults: fractures with relative movement Source: Martin G. Miller/Visuals Unlimited Demo: Cardboard Models Dip-Slip Faults Faults Normal Fault: Hanging Wall Down Hanging wall overhangs the fault plane KEY BED Hanging wall is down Foot wall under the fault plane KEY BED Source: John S. Shelton Especially common in divergent margins Dip Slip Faults Structural Geology is taught by Dr. Kroll...
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