Geology in a Jiffy: Understanding Folds

What is the axial plane in a fold?

• The point where the fold starts

• The line that runs along the top of the fold

• The plane that divides the fold symmetrically

• The outermost layer of the fold

How can you remember the shape of an antiform?

• It resembles a letter U

• It forms a straight line

• It looks like a capital A

• It looks like a zigzag

In an anticline, where are the older layers located?

• Below the younger layers

• Above the younger layers

• On the outermost part of the fold

• In the core of the fold

What characterizes a tight fold?

• Limbs that are far apart

• Limbs that are horizontal

• Limbs that are close together and steeply dipping

• Limbs that are parallel

What is a monocline fold?

• A fold with a vertical axial plane

• A fold with a horizontal axial plane

• A fold with parallel but offset limbs

• A fold with one limb

What is the difference between a symmetrical and an asymmetrical fold?

• Symmetrical folds have limbs dipping at different angles

• Asymmetrical folds have a vertical axial plane

• Asymmetrical folds have limbs dipping at different angles

• Symmetrical folds have a horizontal axial plane

What is a recumbent fold?

• A fold with a vertical axial plane

• A fold with a low-angle axial plane

• A fold with a steeply inclined axial plane

• A fold with a horizontal limb

How is a dome structure formed?

• By depressing layers into a basin

• By uplifting layers at one point

• By folding layers into a V-shape

• By compressing layers of rock

What is the characteristic shape of a chevron fold?

• U-shaped

• Circular

• V-shaped

• Straight

What is a basin in geological terms?

• A steeply inclined plane

• A flat horizontal layer

• A depressed circular structure

• A raised circular structure