Radiometric dating controversy

The Asian specimens show some general differences from African erectus, including more robust ridges of bone with the walls of the skull greatly thickened.The Javanese specimens are a source of great controversy.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 skullcaps are also characterized by flat, thick, rectangular parietal bones.The facial bones are massive, and the mandibles are very robust.

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For example, the Modjokerto child was discovered by a hired workman in 1936, and the specimen was “dated” decades later by looking at the material that adhered to the cranium, and matching that matrix to a strata based on the information of where the specimen was found, finding a strata that matched the material taken from the specimen, then dating the samples of stratum that were assumed to be where the specimen originally came from.

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.

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.

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