Snowball Earth – The argument against…

In last week’s blog I outlined the evidence put forward for a worldwide glaciation in the Neoproterozoic, supported by geophysical and geochemical evidence. However, as with all ground breaking developments, other geologists look at the exposures and geophysical data and come to rather different conclusions. The basis of the idea is generated by the Neoproterozoic [...]

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Snowball Earth – The argument for…

Worldwide Precambrian tillites have been recognised for some time. The closest to us is the Port Askaig Tillite in the Dalradian. Many contain striated boulders; the Smalfjord diamictite in northern Norway rests upon a striated pavement. The term diamictite is now generally used for tillites and rocks with a similar lithology. As geological knowledge and [...]

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