the actual contents of the shales from the Kaapvaal Craton (Archean and Proterozoic) are approximated to be on an average of ˜2 wt.%. These values and the average organic of the modern marine sediments are similar. This is a suggestion to mean that the organic elements preserved and the organic productivity in an ocean during a specified duration were same as to those in the earlier era

so long as there was a close relationship in the elasticity of the sediments. Additionally

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