So when the geological record shows a layer of carbon over an entire continent, that means that an extreme heat event took place in such a way as to also minimize the effect of available oxygen. This really means no more than that the volatiles produced burned away from the carbon which is what one could expect from an external continental heat event.
Not surprisingly the extinction of the mega fauna and Clovis culture clearly coincides with this particular event horizon. We can expect to find that this also coincides with the abrupt extinction event that also overwhelmed Siberia wiping out the mammoths apparently there in a single day. The carbon dating ranges between 12.7 through 13.5 which is well within the expected scatter for a geographically distributed event taking place over twelve and a half thousand years ago. We are actually almost at a time range in which any resolution is breaking down and we must be extremely wary of any single data point.
What has been shown is that just like the dinosaur event horizon, the post event strata have no mega fauna or Clovis artifacts. The distribution of the charcoal horizon is so far all of North America east of the mountains and south of the ice sheet. It also includes a locale in Belgium were the surrounding area was still I think largely locked in ice also.
Imagining a thermonuclear blast centered on the western Arctic and traveling in the southeast direction is an excellent analogy. The battering of the Carolinas with ice chunks creating the impact bays rounds out the story. The heat blast would have swept the continent and likely dissipated only on traveling over open water. If the impact was in the mile thick ice then the crater may have lacked a scaring event on the underlying rock. I rather imagine that there is a lot more evidence to be found in the form of ice generated impact events.
What we have just described is a sharp tangential blow to the polar icecap and crustal area. This was enough to get the crust moving and a lot less than otherwise required which has been recognized by other commentators to be problematic as to survivability. Once the crust was moving, the polar center of mass shifted to the current configuration thirty degrees off the original axis, which is just about were you would expect it to end up.
This placed the northern ice cap firmly into the northern temperate wind belt commencing the melting process and the immediate temperature drop for the global climate since called the Younger Dryas. This melting took place over the next twelve hundred years. During this time the Gulf Stream was established and the Scandinavian ice sheet destroyed. A monster onshore sea was created against the melting ice waiting to break out into the Atlantic. Its collapse sped the final collapse of the remainder of the polar icecap.
It is possible that the sure knowledge of the pending collapse of great onshore sea was culturally remembered giving rise to the legend of the flood. Through all this the sea level rose three hundred feet, flooding the continental shelf for the first time. But once complete, the Younger Dryas abruptly ended and the world has settled down into the most stable climate seen the emergence of the Panama Isthmus. This is natural since the Gulf Stream now dumps enough heat directly into the polar region to make sure of it.
It was a great global catastrophe but also the harbinger and creator of the Northern Temperate Zone that we have relied on for the past ten thousand years. We now have the critical evidence to support my original hypothesis of a Pleistocene event. That the event was clearly an amazingly well directed meteor strike was more than I for one was prepared to anticipate. That it hit as it did saved most of humanity and life on earth in general while releasing the crust to settle in a very advantageous location.
And that children, is a problem. We have several incredibly unlikely coincidences. That alone opens the door to whether our ancestors or someone else planned this event as a direct act of terraforming. I could only speculate on what was possible, but never a precisely targeted silver bullet that got the job done with no waste. It is a bit too good to be true.
The apparent recent emergence of the planet Venus is also another act of very convenient world building or at least the preparation for such. This is controversial of course, but the evidence to date supports just that proposition and certainly does not rule it out. Read Pleistocene Nonconformity.
If we had proper space propulsion tomorrow, we could immediately start to terraform Venus with little difficulty. We just need to move comet junk out of the Kuiper Belt and bombard Venus.