Deductions from smooth rocks
Item
Title
Deductions from smooth rocks
Is Part Of
Geological Sciences
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Description
Extract from Bettie Higgs's reading of rocks in 'Visual Practices Across the University'.
Most of the rocks in this photograph are about 360 million years old, so the grains that comprise them are substantially older. The grains came originally from a mountain range, as large as the Himalayas, whose roots can still be seen in counties Mayo and Donegal, in the northwest of Ireland. The grains were carried south by rivers and deposited in this area; the smallest grains were carried all the way to the ocean, which was far south of Cork at the time, in what is now the Atlantic Ocean south of Ireland. (There was very little rainfall at the time: the portion of land that is now Cork was 10° south of the Equator. This can be deduced from the properties of the iron in the rock.) The water in which the grains were transported was oxygenated, and the iron precipitated out as iron oxide (haematite), which cemented the grains and which accounts for the red color (Elkins 2007: 74 - 78).
Most of the rocks in this photograph are about 360 million years old, so the grains that comprise them are substantially older. The grains came originally from a mountain range, as large as the Himalayas, whose roots can still be seen in counties Mayo and Donegal, in the northwest of Ireland. The grains were carried south by rivers and deposited in this area; the smallest grains were carried all the way to the ocean, which was far south of Cork at the time, in what is now the Atlantic Ocean south of Ireland. (There was very little rainfall at the time: the portion of land that is now Cork was 10° south of the Equator. This can be deduced from the properties of the iron in the rock.) The water in which the grains were transported was oxygenated, and the iron precipitated out as iron oxide (haematite), which cemented the grains and which accounts for the red color (Elkins 2007: 74 - 78).
Creator
James Elkins
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Date Created
2007
Source
Elkins, J.2007. 'Visual Practices Across the University'. München: Fink.
Resonances
James Elkins
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exhibition
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observation
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Ireland
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university
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specialisation
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visualisation
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volcano
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meteorite
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haematite
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movement
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friction
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Julian Jackson
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medicine chest
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Type
Text