Radiometric dating controversy
The Middle Pleistocene is where the modern human postcrania develops, the modern cranial features begin to develop, and significant increases in brain size occur.
Dubois made his find public a few years later, and was met by derision from the dominant British paleontological hierarchy.To the embarrassment of many a very intelligent man and woman of science, overly confident conclusions and arrogant statements have been made based on such similarities that have, on occasion, turned out to be not only wrong, but painfully wrong.It is fine to hypothesize that similarities between different creatures are the result of common ancestry, but since such similarities have been and are often conflicting when compared with other features, it might be prudent to hold back a little when making conclusions about any sort of definite taxonomic classification model or even relationship.This is where the things most people consider “human” start to develop to the point where most people would recognize these pattern of anatomy and behavior as human. 1er Congrès International de Paléontologie Humaine, Nice, Prètirage. This is also a dynamic time in the evolutionary perspective caused by these species, with the recent well-dated Dmanisi remains in the Republic of Georgia, dated to 1.7 myr. The European material will not be discussed here (it is discussed under This view has some validity in that these species are usually considered “chronospecies” due to anagenesis. This is the most complete early human skeleton ever discovered.
Some researchers do not support the concept of anagenesis as a valid mechanism of speciation, since there is a “fuzzy” area where the transition between species occurs, whereas in cladogenesis (the splitting of a species into two new species or the branching off of one species from another) there is a “clear” boundary. The specimen was dated to 1.6 myr, and is considered by some as 15000 had small intercostal muscles (used for fine air control during speech in modern humans).
In any case, shows clear trends in the modern direction, and I personally think that the most parsimonious answer is that erectus is an ancestor of modern humans, and not an evolutionary dead-end. Considering it is within the human range at all, it makes it unlikely that this would have prevented the capacity for speech, and since it is a juvenile specimen, sweeping statements about the species capacity for language based on this trait is very weak. This fairly complete cranium is responsible for sinking the single species concept as a hard and fast rule. This is usually considered the remains of a female due to the decreased level of robusticity compared to conspecifics such as 7 or Sangiran 17 from Java.
The Zhoukoudian occipital bones are strongly flexed with a broad torus across the bone’s width.
In considering the theory of human evolution it is interesting to note that some very well known scientists have actually suggested that the line of human evolution is far from clear.
For example, in 1990, Richard Leakey himself said that, "If pressed about man's ancestry, I would have to unequivocally say that all we have is a huge question mark.
The skullcaps are also characterized by flat, thick, rectangular parietal bones.