Scottish rocks prove 'boring billion', not so boring


Scotland

Credit: CC0 Public Domain

The rocks of Scotland have gained evidence of a previously unknown Ice Age that shed new light on the evolution of the planet.


Scientists at the University of Aberdeen have analyzed rocks in the northwestern highlands of Trojan and found evidence of iceberg debris melting in the lakes.

The rocks date back to a period known as the "boring billion" that occurred from 1800 to 800 million years ago. This geology uses the term to describe a relatively quiet period in the evolution of the Earth, with little climatic rise.

However, this latest discovery suggests that this period may include another ice age to add to what has happened in Earth's history.

Professor Adrian Hartley led the research that was published Geology of the Scottish JournalAlong with colleagues at the University of Aberdeen School of Geology.

Professor Hartley said: "In the Middle Ages of the Earth they think that not much has happened on the planet.

"In all of these so-called 'boring billions', the global climate was moderate and unchanged. Life was limited by algae in the ocean, land was completely barren, and oxygen was 10% more than it is now.

"So far, no evidence of climate change has been found, but our research has shown that there was ice on the surface of the Earth during this period.

"We made this discovery by analyzing billions of years of slippery lake sediments, which would allow us to identify the places where pebbles came from melting ice sheets and formed impact properties on the lake floor, even older layers of deformable sediments."

"Such studies will allow us to reconstruct the history of the Earth's most recent glacier, but it will take us even further when Scotland was at 35 ° S – the same latitude as South Africa.

"This is the first evidence that is globally present in the history of the Earth at this time."


Earth's & # 39; boring billion & # 39; The mediocre oceans of the years could have been really dynamic


More info:
Adrian Hartley et al. Ice rafting in lakes in the early Neoproterozoic: Dropstones in the Diabaig Formation, Torridon Group, NW Scotland, Geology of the Scottish Journal (2019). DOI: 10.1144 / sjg2019-017

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University of Aberdeen

Quote:
The Scottish Rocks Confirm That The "Boring Billion" After All Was Not So Boring (9 January 2020)
Retrieved January 9, 2020
https://phys.org/news/2020-01-scottish-billion-wasnt.html

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