Flashcards on Classification of Geological Folds
Classification of Geological Folds: A Student's Guide
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Geological folds (fold classification)
7 cards
Card 1
Question: What four main features are used to classify geological folds?
Answer: Direction of closing; Attitude of the axial trace; Size of the interlimb angle; Feature of profile.
Card 2
Question: What does 'direction of closing' refer to in fold classification?
Answer: Whether a fold closes upwards, downwards, or sideways (facing/closing direction).
Card 3
Question: What is an antiform (anticline) in terms of limb dip and rock age in the core?
Answer: A fold that closes upwards where limbs dip away from the hinge; bedding becomes younger upwards; it contains older rocks in its core (anticline).
Card 4
Question: How is a synform (syncline) defined regarding limb dip and rock age in the core?
Answer: A fold that closes downwards where limbs dip towards the hinge; a syncline/synform contains younger rocks in its core.
Card 5
Question: What term is used for folds that close sideways?
Answer: Neutral folds (folds which close sideways).
Card 6
Question: What is the difference between the terms 'antiform' and 'anticline' as used here?
Answer: Antiform describes the shape (limbs dip away from hinge); anticline is the more familiar name when it contains older rocks in its core (bedding younge
Card 7
Question: What is the relationship between 'synform' and 'syncline' as used in the classification?
Answer: Synform describes the downward-closing shape (limbs dip toward hinge); syncline is the term used when it contains younger rocks in its core.