Forbidden Archeology_ The Full Unabridged Edition - Michael A. Cremo [471]
Apart from size, the physical structure of modern human brow ridges is different from that of other hominids. “The brow-ridge over each eye is made up of two component parts in Homo sapiens ,” wrote Leakey (1960d, p. 164). “One part in each case starts just above the nose and extends sideways and slightly upwards to overlap the second part, which, on either side, starts at the extreme edge to right and left of the eye-socket respectively, and extends inwards and slightly downwards. Thus, above the center of each eye-socket, there is an overlap of the two elements.” In Neanderthal, Homo erectus, and Australopithecus, the large brow ridges are most often composed of a single barlike mass of bone running horizontally over the eye sockets. To Leakey (1960d, p. 165), the presence of such barlike brow ridges “suggested not an ancestral stage in human evolution but a side branch that has become more specialized, in this respect, than any Homo sapiens type.”
In addition to features found in the earliest presumed human ancestors (the Miocene apes such as Proconsul ), modern humans also have, said Leakey, other specializations that distinguish them from Homo erectus and Australopithecus.
For example, the jaw of modern Homo sapiens has a chin eminence, which Leakey (1960d, p. 168) described as a “bony buttress on the front of the middle line of the jaw.” Living apes do not have a true chin eminence, and neither do Homo erectus and Australopithecus.
According to Leakey, the purpose of the chin eminence is to strengthen the front portion of the jaw. In apes this is accomplished by the simian shelf, a ridge of bone running between the two sides of the forward part of the lower jaw. In Neanderthals, Homo erectus, Homo habilis, and Australopithecus, none of which have a simian shelf, the strengthening is accomplished by thickening the entire front portion of the jaw.
In making his case, Leakey also considered the presence of a feature of the facial skeleton called the canine fossa. Leakey (1960d, pp. 165–166) stated: “If we look at the facial region of different types of Homo sapiens we find that . . . there is always present a depression or hollow in the bone beneath each eye, which is called the ‘canine fossa.’. . . In the great apes and in the skulls of human species other than Homo sapiens it is only very rarely seen and is more commonly replaced by a convexity or puffing out of the bone in that region.”
Other anatomical differences between Homo sapiens and its presumed ancestors, as discussed by Leakey (1960d), involved the tympanic plate around the ear hole, the mastoid process, the articulation of the jaw, and the position of the foramen magnum.
Time, said Leakey, was another problem. Not only was Homo habilis contemporary with Australopithecus, thus eliminating the latter, in Leakey’s mind, as a human ancestor—there was also trouble with the supposed transition from Homo erectus to Homo sapiens. Leakey (1971, p. 27) wrote: “The textbooks, on the whole, still suggest that Homo sapiens stems from Homo erectus; this view can no longer be sustained. The time interval between Java and Peking man in Asia, or the Olduvai form of Homo erectus in Tanzania, and the appearance of Homo sapiens over a wide area from Europe and east Africa is far too short.” The later specimens of Homo erectus in Java and China, and in the upper levels of Olduvai Gorge, existed from 200,000 to 500,000 years ago in the Middle Pleistocene. Early Homo sapiens, is said to have appeared 300,000 to 400,000 years ago. In other words, Homo erectus and Homo sapiens were roughly contemporary, and this, to Leakey, seemed to eliminate Homo erectus as a human ancestor, although others might suggest that humans branched from Homo erectus far earlier.
Here we are, of course, restricting ourselves to conventionally accepted fossil evidence. In previous chapters,