Talk:Cryogenian

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(William M. Connolley 18:43, 22 Sep 2004 (UTC)) I've merged this with Varanger glac. In the course of that I removed:

However, carbon isotope analysis indicates that several worldwide glaciations may have occurred.

Carbon dating doesn't go back the far. I think. Radiocarbon dating says 50kyr.

The carbon analysis here isn't C-14 decay, actually, it's calculating the concentrations of stable C-13 in sediments. The more carbon that's locked away in sediments means that there's fewer greenhouse gases left to warm the atmosphere.

The Caltech link is broken. RandomCritic 16:51, 23 November 2006 (UTC)

Me being hyperprecize: the carbon analysis is [¹³C:¹²C] balance, natural isotopic balance implying inorganic origin, deviation from natural implying organic origin. Organic origin implies no glaciation, inorganic origin may imply glaciation or some other harsh conditions for life. Rursus 21:40, 27 December 2006 (UTC)

[edit] Varanger??

As much as I've experienced, there seem to be no scientific consensus to what Varanger and Marinoan refers. I've seen Varanger referring to a short glaciation around ~570 Ga, which was otherwise called Gaskier's. I may be wrong however... Rursus 21:43, 27 December 2006 (UTC)

The term Varanger is now depreciated. It referred to any or all of the glaciations in the Snowball Earth period. Verisimilus T 22:52, 9 May 2007 (UTC)

[edit] ...Oh, dear...

I think we need a massive rewrite of this article: It's one of the most layman-unfriendly articles I've seen, not only failing to explain terms, but often using an obscure geological term where a perfectly good common-language term is available, such as use of Ma for dates, "tillage" for glacial deposits, etc. Adam Cuerden ^talk 20:42, 21 May 2007 (UTC)

I've had a go at the first paragraph, but am not really sure what to do after that.... Adam Cuerden ^talk 21:02, 21 May 2007 (UTC)

I have made a pass over both paragraphs. I think the geological terms are fine since it's an article on geology, but have tried to give some contextual cues and to streamline the sentence structure. --Reuben 16:18, 18 September 2007 (UTC)