Structural Geology (Part A)

Question 1

Sedimentary rock strata generally consist of parallel….separated by…..

(1 word, 2 words)

Answer 1

Beds, bedding planes

Question 2

Discontinuities running at right angles to each other and roughly perpendicular to bedding direction are called….

(1 word)

Answer 2

Joints

Question 3

An outcrop occurs where a rock….meets the ground surface

(1 word)

Answer 3

Bed

Question 4

On a bedding plane the direction of horizontal is called the….

(1 word)

Answer 4

Strike

Question 5

Lines drawn on a bedding surface which connects points of equal height above ordnance datum are called….lines

(1 word)

Answer 5

Strike

Question 6

Dip is the maximum….below….made by a bedding plane

(1 word, 1 word)

Answer 6

Angle, horizontal

Question 7

The dip of a bed must be given in terms of both….and….

(1 word, 1 word)

Answer 7

Amount or Angle, direction

Question 8

An outcrop of young rock surrounded by older rocks is called an…

(1 word)

Answer 8

Outlier

Question 9

Arch-shaped folds are called…and trough shaped folds are called….

(1 word, 1 word)

Answer 9

Anticlines, Synclines

Question 10

A fault is formed when rocks….along a…plane

(1 word, 1 word)

Answer 10

Fracture, Shear

Question 11

Give two terms used to describe a fault at which movement is predominantly horizontal

(4 potential)

Answer 11

Wrench, tear, transform, transcurrent

Question 12

On a geological map the same beds may appear repeated in either side of a….fault

(1 word)

Answer 12

Strike

Question 13

A line of 0.2mm thickness drawn on a 1/50,000 scale map represents a thickness of….meters on the ground

(1 word)

Answer 13

10m

Question 14

A fold is formed when rocks….

(1 word)

Answer 14

Bend

Question 15

An outcrop of old rocks surrounded by younger rocks is called an….

(1 word)

Answer 15

Inlier

Question 16

What is true dip?

Answer 16

The maximum angle the bed makes with the horizontal

Question 17

What is apparent dip?

Answer 17

A smaller slope values in other directions as the direction moves round towards the strike direction

Question 18

What is a strike line?

What else is a strike line known as?

Answer 18

A line at right angle to the true dip

A structure contour

Question 19

What does an unconformities represent?

What are the three types of unconformities? (T, D, S)

Answer 19

A period of time during which strata are not laid down

Time, Deposition, Structure

Question 20

Describe the bending in:

Limb folding

Anticline folding

Synclines folding

Answer 20

Limb- beds on the side of the fold

Anticline- beds are bent upwards

Synclines- beds are bent downwards