coherent, complex & dynamic timeline
- From: "Chapstick" <chapstick@xxxxxxxxx>
- Date: Mon, 22 Jan 2007 21:20:26 -0500
my own snippett from an earlier thread:
"To summarize what I am trying to think... I am interested in a sort of
coherent, complex & dynamic, timeline of human development. I think we all
want that. How did we become this thinking being? and not just another
chimp? Does the chimp "think?" and etc."
and this timeline from sap (Charles and Phillip):
abbreviations:
LCA = Last Common Ancestor (with Pan)
PA = PaleoAnthropology
~ = about
mya = million years ago
kya = thousand years ago (this in preference to using BC)
HN = Homo Neanderthal...
hss = us, modern humans
225 mya = evolution of mammals during the Triassic
65.5 mya = the K-T boundary... extinction of dinosaurs, Cf. the Chicxulub
structure on the Yucatan
~16 mya = pongoids split into orangutangs/hominoids (gorilla, pan, homo)
~10 mya = gorilla/pan-homo split
~ 8 mya = pan/homo split (ie, our LCA was 5-9 mya)
4.5 mya = Ramidus (an intermediate??)
3.5 mya = early afarensis (Lucy) (apiths)
2.5 - 1.8 mya, = homo erectus (currently believed to be in our line)
~600 kya = Neanderthal/Homo sapien split (or 230 kya)
400 kya - various African erectoids.
~120 kya = something happens to make us "more human". (this date fluctuates
between 200 kya and 70 kya).*
60 kya = presumed that humans used a boat to arrive in Australia
40 kya = "explosion" into Hss...Cro-Magnon cultures expand
~30 kya = Neanderthals extinct.**
~25 kya = remnant erectoids of Austro-Asia go extinct
14.5 kya = Clovis culture Native Americans enter North America.
10 kya = invention of writing (this took until 7 kya to solidify)
4.5 kya = pyramids built
* one could say that between 180 kya and 120 kya, "a predisposition for
human culture distinct from other hominoids evolved." --Phillip D.
** the first presumed entry of modern humans into Europe, then the domain of
the Neanderthal, was about 43kya. The last known HN fossils are from Vindija
in Croatia dated between 28-29 kya.
and this little snippett about the K-T extinction from Wiki:
http://en.wikipedia.org/wiki/Cretaceous-Tertiary_extinction_event
"Omnivores, insectivores and carrion-eaters appear to have survived quite
well. It is worth noting that at the end of the Cretaceous there seem to
have been no purely vegetarian or carnivorius mammals. Many mammals, and the
birds which survived the extinction, fed on insects, larvae, worms, snails
etc., which in turn fed on dead plant matter. So they survived the collapse
of plant-based food chains because they lived in "detritus-based" food
chains."
"No land animal larger than a cat survived."
Any strong disagreements about this data?
By the way, I think it of some interest that as far back as 16 mya, our
"line" was into some sort of nest-building, since the gorilla build a nest
every night & we share that trait.
--chap
.
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