EVIDENCE FOR ISOSTATIC AND EUSTATIC SEA LEVEL CHANGES What does isostatic mean? What does eustatic mean? Which is changing in these photos – land level.

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Presentation transcript:

EVIDENCE FOR ISOSTATIC AND EUSTATIC SEA LEVEL CHANGES What does isostatic mean? What does eustatic mean? Which is changing in these photos – land level or sea level?

Aerial view of the raised beach on the west coast of Arran. Old stacks Raised beach covered with coarse shingle. Old cliff line Diagram from Arrran and the Clyde Islands, Scottish Natural Heritage

Raised beaches ard/physical/features/sea_level /

Raised beach, Newton Point, Arran wave-cut platform old cliff line

King’s Cave, from the Drumadoon sill wave-cut platform old cliff line

King’s Cave All the caves are full of very rounded pebbles, which have the same texture as beach pebbles. The caves also contain many marine shells, which are encrusted with lichens. They are not part of the present marine deposits.

Raised sea stack, Bute. Raised beach Diagram from Arrran and the Clyde Islands, Scottish Natural Heritage

Raised natural arch

Raised beach deposits are usually made of coarse, rounded pebbles. This deposit is cemented with iron. Godrevy Point, Cornwall

Close-up of the Godrevy Point deposit

Marine platforms Island above old sea level

Penberth, Cornwall Marine platform

River terraces

River terraces, NW Scotland

River terraces, Catacol

Drowned coast-lines Drowned glacial trough West coast of Norway Fjord

Norwegian fjord

Drowned coast-lines South coast of Devon ria Drowned river valley

Ria in Cornwall

Raised coastlines Skogarfoss Iceland Atlantic Old cliff line

The End River Skoga, falling over the post-glacial cliff THE END