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The strength of Earth's magnetic field in the past, recorded by rocks and sediments, provides a proxy for past flux of ultraviolet radiation (UVR) to Earth's surface due to the role of the field in modulating stratigraphic ozone. About 40,000 years ago, mammalian fossils in Australia and Eurasia record an important die‐off of large mammals that included Neanderthals in Europe. In the Americas and Europe, a large mammalian die‐off appears to have occurred ~13,000 years ago. Both die‐offs can be linked to minima in Earth's magnetic field strength implying that UVR flux variations to Earth's surface influenced mammalian evolution. For the last ~200,000 years, estimates of the timing of branching episodes in the human evolutionary tree, from modern and fossil DNA and Y chromosomes, can be linked to minima in field strength, which implies a long‐term role for UVR in human evolution.
originally posted by: InTheLight
a reply to: Justoneman
Well, now see that's the question...are they in good standing with their peer reviewers? Are there any peer reviews out there? Has their study been reproduced? How accurate is radiometric dating, really?
www.cs.unc.edu...
originally posted by: InTheLight
a reply to: Justoneman
Some scientists say that it is way too complex and unpredictable and we simply can't make a complete model of the Earth's magnetic behaviour, yet. So we don't know if it's behaviour is haywire or not.
www.esa.int...
The Hopi maintain a complex religious and mythological tradition stretching back over centuries. However, it is difficult to definitively state what all Hopis as a group believe. Like the oral traditions of many other societies, Hopi mythology is not always told consistently and each Hopi mesa, or even each village, may have its own version of a particular story
originally posted by: Creep Thumper
a reply to: Justoneman
Time for you to research the Younger Dryas event. A fragmented comet slammed us around 12,800 years ago. It created a mini-ice age until about 10,600 years ago, during which time megafauna went extinct.
It is also theorized there was a population bottleneck that resulted in us losing advanced technology but, again, that is speculation.
There are a number of stories from many different religions and areas of the world that describe the flood following the impact event.
A number of impact sites have been identified including the most recent one beneath the Greenland ice sheet. I can't remember the total number of impacts. I think it was something like eight or nine.
Something for you to read -
phys.org...
Take with a grain, as Wikipedia can be edited by anyone including flat-earthers -
en.m.wikipedia.org...
originally posted by: Justoneman
From
agupubs.onlinelibrary.wiley.com...
It is a huge paper and will take some time to read but here is a teaser to help you decide if you care to read further.
The strength of Earth's magnetic field in the past, recorded by rocks and sediments, provides a proxy for past flux of ultraviolet radiation (UVR) to Earth's surface due to the role of the field in modulating stratigraphic ozone. About 40,000 years ago, mammalian fossils in Australia and Eurasia record an important die‐off of large mammals that included Neanderthals in Europe. In the Americas and Europe, a large mammalian die‐off appears to have occurred ~13,000 years ago. Both die‐offs can be linked to minima in Earth's magnetic field strength implying that UVR flux variations to Earth's surface influenced mammalian evolution. For the last ~200,000 years, estimates of the timing of branching episodes in the human evolutionary tree, from modern and fossil DNA and Y chromosomes, can be linked to minima in field strength, which implies a long‐term role for UVR in human evolution.
To my ATS family, I am not sure if the two Authors of this paper are in good standing with the scientific community, but that data has had standing to my knowledge and I present it here for discussion and for the true curmudgeons to poke their holes where they can. I accept their facts and challenge any bad logic as it raises it's ugly head.
originally posted by: drewlander
a reply to: Lumenari
I thought i read somewhere recently that one of the two nutcases signing off on a study is oft the original nutcase who did the study, thus only requiring one other nutcase for review. I cannot say exactly but i recall it amounting to something this dumb.
According to one hypothesis, a cometary airburst triggered massive wildfires, which caused the climate to cool. Many scientists have rejected this hypothesis, citing lack of sufficient evidence, in favor of others. The most widely accepted one says that during the deglaciation process, fresh water from the proglacial lake Agassiz discharged into the Arctic Ocean, altering ocean currents.
UVR triggers dissociation of oxygen molecules (O2) into oxygen radicals that combine to form stratospheric ozone that in turn absorbs UVR as it splits into oxygen atoms. Certain ozone‐depleting agents (such as nitrogen oxides) are produced naturally by energetic particle precipitation from solar wind, particularly during solar proton events, and therefore, times of low geomagnetic field strength lead to higher ozone depletion (Randall et al., 2005, 2007).