HIGHER GEOGRAPHY LITHOSPHERE

LIMESTONE SCENERY

There are several types of limestone in Britain - this presentation will concentrate on Carboniferous Limestone and look at the Yorkshire Dales in particular.

These limestones were formed from the fossilised remains of countless marine

plants and animals, such as corals, which lived during the Carboniferous period, 345 - 280 million years ago.

These limestones were formed from the fossilised remains of countless marine

plants and animals, such as corals, which lived during the Carboniferous period, 345 - 280 million years ago.

These former sea beds were moved from the equator due to continental drift

and forced upwards during the Hercynian orogeny or mountain building

period, 280 - 230 million years ago.

These former sea beds were moved from the equator due to continental drift

and forced upwards during the Hercynian orogeny or mountain building

period, 280 - 230 million years ago.

Britain during the Carboniferous.

Here, on the Great Barrier Reef off the Australian coast, is the world’s biggest

expanse of coral reef.

Brain coral, one of the main reef building species.

Brain coral, one of the main reef building species.

• The Dolomite mountains in the Alps - these 3000 metre peaks are made of limestone and were once the bed of the sea!

Limestone - Chemical weathering

• Limestone = Calcium Carbonate• Rainwater = Carbonic Acid• Carbonic Acid dissolves Calcium Carbonate• This is called CARBONATION, a type of

solution weathering.

• Or … H2O + CO2= H2CO3

• CaCO3 + H2CO3 = Ca(HCO3)2

Calcium Carbonate Dilute Carbonic Acid Calcium Hydrogen Carbonate (Soluble)

Carbonation / solution weathering also attacks buildings made from limestoneCarbonation / solution weathering also attacks buildings made from limestone

This type of landscape is more correctly known as Glacio Karst - glacio because

it has also been glaciated, and karst after an area in Slovenia, which gives its

name to this kind of landscape.

This type of landscape is more correctly known as Glacio Karst - glacio because

it has also been glaciated, and karst after an area in Slovenia, which gives its

name to this kind of landscape.

The dry, barren landscape of limestone country.The dry, barren landscape of limestone country.

• Follow the arrows to see the route taken by streams.