Re: Evolution milestones (please check the values)

["David Marjanovic" <david.marjanovic@gmx.at>]

> Space cca 20-12 Ga ago (Solar system 7-5 Ga?)

Maybe.

> Earth cca 4.8-4.56 Ga ago

4.56.

> Life (procaryotes) cca 3.8-3.5 Ga ago

Over 3.85.

> Eucaryotes cca 2.1 Ga ago

Minimum.

> Metazoa cca 0.7 Ga ago (?)

1.1 Ga (worm traces of Chorhat).

> Vertebrates cca 560 Ma ago

That's a bit much. If conodonts are vertebrates, then what about 540?
Otherwise... 510?

> Pisces (fishes) cca 480 Ma ago

Do you mean Gnathostomata?

> Land-dwelling plants cca 475 Ma ago

Sounds good...

> Land-dwelling animals cca 428 Ma ago

Maybe.

> Insect cca 388 Ma ago

Why not.

> Amphibians cca 370-360 Ma ago

Tetrapoda... more than 360. 370 maybe. Real Amphibia is quite a bit younger
(Carboniferous).

> Reptiles cca 330-315 Ma ago

Amniota? The oldest known amniotes are only 310 Ma old, but these are
already rather derived, so 315 is the minimum.

> Dinosaurs cca 230 Ma ago

I have here the "1999 geologic time scale", and it puts the Middle-Late
Triassic boundary at only 227 Ma ago... but this may be too young, because
it puts the P-Tr boundary at 248... 230 can't be far off. :-)

> Mammals cca 220 Ma ago

The newest definition of Mammalia ( = the most recent common ancestor of you
and *Sinoconodon*, and all its descendants) could change this to 200 or so.

> Aves (birds) cca 150 Ma ago

If *Archaeopteryx* is a bird... :-)

> Placental mammals cca 130 Ma ago

No. Eutherian mammals 125 Ma ago (*Eomaia*). The crown group Placentalia is
much younger... perhaps even only 65 Ma. The youngest molecular date is 80
Ma.

> Primates cca 75 Ma ago

No, fewer than 65.

> Human cca 7-5 Ma ago

If you mean "everything closer to us than to the chimpanzees", then yes,
though the minimum is at least 5.3.

> g. Homo cca 2.3 Ma ago

That depends on the definition of *Homo*...

> subsp. H. s. s. cca 160.000 ago

200,000, and that's the crown-group. Our divergence from the Neandertal
folks is more like 600,000 a ago.