Jurassic coast line

Question 1

Where is the Jurassic coastline?

Answer 1

Between Orcombe Point in East Devon and Studland Bay in Dorset

Question 2

Describe Purbeck rock beds

Answer 2

• made of limestone and mud
• dating back 147 million years
• borders the Jurassic and Cretaceous
• deposited in shallow, low-lying salty fresh water lagoons during fluctuating sea levels

Question 3

Describe the Wealden rock beds

Answer 3

• made of sandstone
• dating from 140 million years ago (Cretaceous)
• deposited in fresh water rivers and lakes

Question 4

Describe the greensand beds

Answer 4

• made of sandstone
• dating back 125 million years
• deposited in shallow, turbulant sea

Question 5

Describe the Portland stone beds

Answer 5

• limestone
• 150 million years
• deposited in shallow, calm sea

Question 6

Describe the chalk cliffs

Answer 6

• limestone
• 97 million years
• deposited very slowly in clear, shallow sea

Question 7

How did Lulworth Cove form?

Answer 7

Purbeck limestone gradually eroded then rapidly eroded the cliffs behind

Question 8

How did Kimmeridge Bay form?

Answer 8

Cliff recession happens faster because they consist of unconsolidated clays

Question 9

How did Lulworth Crumple form?

Answer 9

Limestone and shale strata folded due to tectonic movements thirty million years ago when the African and European plates collided

Question 10

What is Stair Hole?

Answer 10

A cove

Question 11

How did Durdle Door form?

Answer 11

Marine erosion on vertical layers of rock

Question 12

How did Warbarrow Bay form?

Answer 12

Less resistant wealden clay eroded to expose the chalk behind which forms the cliffs

Question 13

How did the Foreland form?

Answer 13

Sedimentary chalk headland south of studland, erosive processes occurred to form stacks and stumps (Old Harry and Old Harry’s Wife)