Cenozoic Earth History (Quaternary) - Part 1

[@ankebornhofft-neugebauer9004]

Great explanation of the temperature-dependent C16/C14 ratio! All super presentations!!!

[@mliittsc63]

at 34:51, I think the area is more like 45,000,000 square km. The Laurentide by itself was 13,000,000.

[@scottmcdonald5237]

Excellent science!

[@MrSammer1972]

How could you completely leave out the Younger Dryas period during the pleistoncene to holocene transition after The Bølling-Allerød rapid waming occurred, then temperatures plummeted and then rapidly warmed again, which was a period of climate change that makes our current changing climate look static?

[@abhishekchoudary1341]

Please share pdf / ppt or else the reference material .

[@deninetate]

If there are geologists a million years from now, I think they will date the anthropocene to the point where they detect radioactive isotopes from nuclear tests along with micro-plastic in the rock record. That would place the beginning of the anthropocene in the mid-twentieth century.

[@robertbigott9742]

at 4:51 the IUGS in July 2018 split the Holocene into 3 stages/ages. IUGS - THANK YOU FOR YOUR LOGIC AND COMMON SENSE!

[@ferengiprofiteer9145]

There's been dozens of glaciations and interglacials in the last 2.5 million years. Do cores show a difference in each interglacial? If so, 5 million years from now, manmade changes may not stand out at all.

[@allangibson2408]

There are clear indications in the sediment record of human activity. Lead content of Greenland ice took a rapid rise three thousand years ago from Greek & Roman lead and silver extraction. More recently plastics have formed a significant part of the deposited oceanic sediments. The current interglacial has lasted longer than the previous four and based on insolation we should be entering a new cold period.

[@ferengiprofiteer9145]

@@allangibson2408 We can connect the dots from lead to Rome but 5 million years is a longer time than the current glacial period (2.5 million). Mama nature has a habit of digesting organic molecules so I doubt plastics will be recognizable. I bet our glass and ceramics will bring a smile to some future archaeologists. I agree about a future glaciation. I bet the man made global warming sheep will be more than willing to heat and cook with the dirtiest coal they can find when that ice hits the fan.

[@allangibson2408]

@@ferengiprofiteer9145 Fluoridated hydrocarbons are going to be around for a long time. Teflon is twice as dense as water so it is going down rapidly. Chlorinated hydrocarbons are almost as persistent. The floating polyethylene and polypropylene make up most of the shore deposits with foamed polystyrene (non foamed polystyrene sinks like a rock). Polymer glued sandstones are already being found.

[@ferengiprofiteer9145]

@@allangibson2408 True, but give microbes, enzymes, chemicals, heat, and plate tectonics 5 million years and I'll bet they won't find anything to wonder at what it might be.

[@ferengiprofiteer9145]

@@allangibson2408 If your talking CFCs, scientists have to figure in natural degradation rates to use them as tracers in sea and ground water even now.

[@scottmcdonald5237]

🤯

[@군주-b9v]

White Anna Lewis Dorothy Lee Thomas

[@ferengiprofiteer9145]

Water hasn't had a problem holding up the northern polar ice cap. Why would it have a problem around the south pole?

[@allangibson2408]

Because there is no water holding up the ice at the South Pole - the 3km (2 miles) of ice under the South Pole is sitting on bedrock.

[@ferengiprofiteer9145]

@@allangibson2408 I was referring to the ice shelves he was worried about (as I recall). Ice supported by water is already reflected in sea level.

[@allangibson2408]

@@ferengiprofiteer9145 Ice shelves hold back grounded glaciers (particularly in bays). That is the reason for concern about them breaking up. They also slow water circulation at the leading edge of grounded glaciers which can lead to them melting from the bottom up. A number of ice shelves are in and of themselves grounded on glacial moraines further complicating the picture. The rising sea levels (about a half meter since 1900) as also fed into this by lifting and cracking the grounded ice as well.

[@ferengiprofiteer9145]

@@allangibson2408 Well, icebergs the size of New Jersey have been breaking off the south pole all my life and the Netherlands are still growing tulips so I won't be scaring my grandkids about it.

[@ferengiprofiteer9145]

@@allangibson2408 By the way, it's been a long time but I seem to recall that most of the rise in sea level happened prior to 1950. Could be misremembering.

[@ronb7481]

Did Greta Lundberg write the script? I've suddenly lost my appetite for watching this series.

[@azureprophet]

The earth doesn't care about your feelings.

[@MarkFloyd7451]

Goodbye

[@judsonwall8615]

His presentation is merely summarizing what the vast majority (>99%) of scientists are telling us. If you can’t stomach the science, go watch MTV or your drama news network.

[@robertbigott9742]

I am not a fan of having a new epoch named in such a short period of time. I further believe that the Anthropocene designation was started to stroke some folks egos etc. etc. PS don't bother replying. I never read reply's they are a waste of time.