Apparently having missed a lot (from findings and theories of the recent years research on human prehistorics) we for now focus shortly on these, with these speculations from evolutionary past...for the other topics, if we'll include yet another newspost, it seems we'll have to leave them for that...
(This post has been shortened and little corrected from some misinterpretations in the earlier version...) Our earlier writings from the (quite) recent speculations and theories on human origins left us wondering whether they really are in belief of the current man, homo sapiens (sapiens) having been first to inhabit Australian and (North-)American continents. Since that we've noticed current archaeological knowledge from that quite uniform; Fx no fossil of earlier human ancestors has been found on these areas. Also, the Out-of-Africa-model seems to be nowadays pretty widely accepted and what most scientist these days think as proven knowledge. Continuing our own speculations from such distant times, the summit dates of the human arrival in mentioned continents have pretty much been reasoned to an understanding that it would have happened around 50000 y. ago in the case of Australia and something like (still nowadays less certaint, even less agreement on exact dates...) 20-30000 y. ago when reaching the American continent. Since timings in archaeology often move further past for thousands of years when new fossil founds are made, we just estimate these are probably close to 'real' timings, and that perhaps most correct would estimate about + 5000-10000 years added(for both). Since we ourselves haven't got any very accurate understanding from prehistoric climatic conditions, our estimates are of course as much guessing. (Would perhaps add:) Similar to most archaeological theory, when presenting strict estimations in time-scales reaching further to the (pre) history, like past tens thousands of years. Of course, that's why theories presenting general lines most always give just estimated timings. Also by glance, appears in our sight This BBC-article which mentions the recent corrected timings (in 2003) for of the remains of Mungo Man, though I think it to not prove anything since it's basicly just an example of foundings in certain area. Not solely unquestioned, because the timings have already been couple times 'corrected' with new methods (earlier estimates were as various about 30000 and 62000 y.), but also because there seems to be not any simple way to prove with co-arguments the conclusions made on the basis of DNA-research, etc.
The early population numbers in certain continents cannot be easily estimated either; these may have varied, gone up and down during periods of climatic changes and other circumstances, perhaps even some areas being inhabited several times continuously just because the preceding wave hasn't been successive for some reasons. Actually that's the supposition which is sometimes presented concerning the 'Out-of-Africa-hypothesis', they've timed the first population flow around 100 000 years ago on the basis of the earliest living sites and fossils found in the Africa/Near East. Subsequently this is thought to have resulted in populating the other continents as well.
Also, many current theories (partly, at least) seem to present early human populations as having gone through periods when populations had temporarily reduced rapidly (during which periods of time or even if as resulting from climatic circumstances isn't probably known with any certainty). One, often mentioned guessing seem to be the theory of Toba earthquake in Sumatra around 71000 y. ago (largest known volcanic eruption in Earths past history, during the last 400 million years), in the middle of ice age at the time. Subsequent fast change of climate to cooler temperatures might then have caused the decline in existing populations. The more recent theory, seems to place more concern on suppositions that in earlier times human populations were down due to other reasons (like continued droughts in Africa) resulting for two divided populations where groups were living in distinct areas of Africa for longer periods. Probably the suppositions on probable timing which follows(of the departure from continent) are not to be considered as definitive either but also, one might suppose that it's also matter of how moving and capable for crossing waters one thinks these early population groups having been.
But, all these views on rather recent theories are developed quite much with methods of Molecular Anthropology as well as findings on some earliest known excavation places in Africa/Near East. One can at least notice that the archaeologist seem quite convinced of human (Sapiens sapiens) populations having been through some times of reduction in between 150 000 – 50 000 ago (sometime during that period of time, whether this can by numbers be proven even in estimated amounts, I'm a bit suspective on that too...). But, also, since we don't seem to have here adequate methods to speculate any further on this basis, and because this field now starts to seem far too complicated to our resources here, we are likely to end our speculations here.
Powered by ScribeFire.
No comments:
Post a Comment