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Comment by mc32 | Hacker News Reader

Looking at this map[1] of known impact craters, it looks like of the landmasses, eastern Canada, (western) Australia and northern Eurasia have experienced the most impacts and Africa, China and South America have experienced the fewest (Antarctica largely unknown).

Now one thing which the map doesn’t represent is the position (coöperdinates) of the affected landmass at time of impact.

[1]https://upload.wikimedia.org/wikipedia/commons/c/cc/Earth_Im...

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The results are affected by the density of geologists.

Yep, just like dinosaur fossils.

Africa, China and South America have wonderful geologists and people just like America and Europe. What are you trying to say?

There have been more geologists per area in the places where lots of astroblemes have been found. It's a selection effect, not a real effect.

I think they're saying there are fewer, nothing about their ability.

Right.

BTW, you should note the increasing volume of paleontological discoveries coming out of China these days.

> Africa, China and South America have wonderful geologists and people just like America and Europe.

Sure, but geology was largely created by Christians looking for proof that the bible was true, and then was later developed by people looking to prove that Christianity was false. So you have more geologists in areas with lots of people who have an axe to grind one way or the other with respect to that religion.

What’s interesting is the lack of “discoveries” in the Middle East, given the amount of drilling and geological work going on there. I guess when the oil is easy, there’s no motivation to look too hard.

It may also be that the area is geologically newer. (Disclaimer: I have no idea if it is.)

I like that the Carancas impact event is listed as .000007 mya. I happened in 2007.

Could be related to age of crust?

All the continents have very old parts.

https://en.wikipedia.org/wiki/List_of_shields_and_cratons

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