B5. Explain, with examples, how the global record of sea-level and climate chang

Question

B5. Explain, with examples, how the global record of sea-level and climate change has controlled the Phanerozoic strata of the British Isles. B6. ‘The geological history of the British Isles since the Late Permian has been dominated by the breakup of Pangea.’ Discuss the validity of this statement, with specific reference to evidence from strata in the British Isles.

B6. ‘The geological history of the British Isles since the Late Permian has been dominated by the breakup of Pangea.’ Discuss the validity of this statement, with specific reference to evidence from strata in the British Isles.

Explanation / Answer

B5. The global sea level and climate change were occured in the journey of British isles.

Starting with Cambrian period the all the European blocks was away from each other and they are below sea level

Till the end of silurian, they were in the below sea level, but when lapetus ocean closed slowly, all these blocks come together in which British isles formed.

In Devonian, the uplift occured because of Caledonian orogeny that's why all the British isles part exposed above sea level. At that time the British isles was in the southern arid region which means arid to semi arid climate prevails which forms the red sandstone.( red is because of oxidation)

In carboniferous, the British isles was migrated toward the equator and stop at the equatorial region which is hot which means melting of glacier again which means sea level rise.

In Permian triassic boundary, British isles moved to the northern arid region where sea level dropped and that's why red sandstone was formed.

In jurassic, the pangea break up and rifting occurs which formed the Atlantic Ocean. Of course sea level rises and marine life prevails. At the end of jurassic sea level falls.

In cretaceous, sea level still high, marine life prevails.

In Paleocene, eocene, oligocene, the volcanic activity was high and all volcanic rocks are evidenced for these rocks at British isles

At the time of miocene, pliocene epochs the sea level drop because of glaciation starts.

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B6. At the time of carboniferous period the pangea assembled completely, and at the early jurassic period the pangea break up. The evidences best support this activity is triassic period fossils is found on the British isles.

The orogeny are another evidences, like Hercynian orogeny which produced Hercynian mountains of Britain. and when pangea break off, the reason was rifting which formed the Atlantic Ocean.

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