Apropos of nothing much, but give this a listen. He's a proponent of adjacent conspiracy theories and rants here about how the whole Tartaria thing got slapped together online.
https://youtube.com/watch?v=oX85CGL5t_I
Not to go TO off the rails but I use "Tartaria and mudflood" as more or less "buzzwords" for a larger world view that is more about questioning historical sources post world war 2 specifically but also in the 1800 era
Go find any old textbook or map and check out Siberia, you will find a national called tartaria, its not like its "made up" the "conpsiracy" is that they were not just a nomadic horse rearing people but might have been the first to make it to the new world via the "top of the world" or arctic pass ( I have multiple maps where that artic sea above sibera is called the "Tartarian sea")
Contrary to what people have been wanting us to belive for the last 50 million years (until very recently) we have been on an insane, like historic, tempature falloff
Source
5 million years ago till now the temperatures around the poles could have been MUCH warmer and in the PROCESS of freezing back up
I have many old maps showing the north of greenland as well as the northern shore of Russia, Finland and Alaska as DISTINCTLY tropical
take everything I say with a grain of salt as im sure most will, ohh and not to be rude but guys like him(the video) are old as the internet, they appear to be "in the community" but just debunk stuff and appear more credible by being "one of us"
Just to take it one step further
those "sheer jumps" are what are HYPOTHISIZED TO BE, previous iterations of humans(or some other intelligent species)rising and falling
Keep in mind ALL of KNOWN ACCEPTED human history is just in that final little uptick