Summary
In 1955, The Urantia Book asserted that a “mid-mammal” existed a little more than one million years ago and that a mutation occurred in this low population group that led to both human beings and modern simians. In 2016, geneticists from the University of Leicester chimpanzee “Adam” lived around one million years ago.
(62:2.1) A little more than one million years ago the Mesopotamian dawn mammals, the direct descendants of the North American lemur type of placental mammal, suddenly appeared. They were active little creatures, almost three feet tall; and while they did not habitually walk on their hind legs, they could easily stand erect. They were hairy and agile and chattered in monkeylike fashion, but unlike the simian tribes, they were flesh eaters. They had a primitive opposable thumb as well as a highly useful grasping big toe. From this point onward the prehuman species successively developed the opposable thumb while they progressively lost the grasping power of the great toe. The later ape tribes retained the grasping big toe but never developed the human type of thumb.
(62:3.12) And so it may be readily seen that man and the ape are related only in that they sprang from the mid-mammals, a tribe in which there occurred the contemporaneous birth and subsequent segregation of two pairs of twins: the inferior pair destined to produce the modern types of monkey, baboon, chimpanzee, and gorilla; the superior pair destined to continue the line of ascent which evolved into man himself.
(62:3.13) Modern man and the simians did spring from the same tribe and species but not from the same parents. Man’s ancestors are descended from the superior strains of the selected remnant of this mid-mammal tribe, whereas the modern simians (excepting certain pre-existent types of lemurs, gibbons, apes, and other monkeylike creatures) are the descendants of the most inferior couple of this mid-mammal group, a couple who only survived by hiding themselves in a subterranean food-storage retreat for more than two weeks during the last fierce battle of their tribe, emerging only after the hostilities were well over.
Select Urantia Book quotes
(61:6.1) The great event of this glacial period was the evolution of primitive man. Slightly to the west of India, on land now under water and among the offspring of Asiatic migrants of the older North American lemur types, the dawn mammals suddenly appeared. These small animals walked mostly on their hind legs, and they possessed large brains in proportion to their size and in comparison with the brains of other animals. In the seventieth generation of this order of life a new and higher group of animals suddenly differentiated. These new mid-mammals—almost twice the size and height of their ancestors and possessing proportionately increased brain power—had only well established themselves when the Primates, the third vital mutation, suddenly appeared. (At this same time, a retrograde development within the mid-mammal stock gave origin to the simian ancestry; and from that day to this the human branch has gone forward by progressive evolution, while the simian tribes have remained stationary or have actually retrogressed.)
(62:1.3) With the passing of time the seacoast of India southwest of the mountains gradually submerged, completely isolating the life of this region. There was no avenue of approach to, or escape from, this Mesopotamian or Persian peninsula except to the north, and that was repeatedly cut off by the southern invasions of the glaciers. And it was in this then almost paradisiacal area, and from the superior descendants of this lemur type of mammal, that there sprang two great groups, the simian tribes of modern times and the present-day human species.
(62:2.1) A little more than one million years ago the Mesopotamian dawn mammals, the direct descendants of the North American lemur type of placental mammal, suddenly appeared. They were active little creatures, almost three feet tall; and while they did not habitually walk on their hind legs, they could easily stand erect. They were hairy and agile and chattered in monkeylike fashion, but unlike the simian tribes, they were flesh eaters. They had a primitive opposable thumb as well as a highly useful grasping big toe. From this point onward the prehuman species successively developed the opposable thumb while they progressively lost the grasping power of the great toe. The later ape tribes retained the grasping big toe but never developed the human type of thumb.
(62:3.11) Contemporaneously with the birth of these Primates twins, another couple—a peculiarly retarded male and female of the mid-mammal tribe, a couple that were both mentally and physically inferior—also gave birth to twins. These twins, one male and one female, were indifferent to conquest; they were concerned only with obtaining food and, since they would not eat flesh, soon lost all interest in seeking prey. These retarded twins became the founders of the modern simian tribes. Their descendants sought the warmer southern regions with their mild climates and an abundance of tropical fruits, where they have continued much as of that day except for those branches which mated with the earlier types of gibbons and apes and have greatly deteriorated in consequence.
(62:3.12) And so it may be readily seen that man and the ape are related only in that they sprang from the mid-mammals, a tribe in which there occurred the contemporaneous birth and subsequent segregation of two pairs of twins: the inferior pair destined to produce the modern types of monkey, baboon, chimpanzee, and gorilla; the superior pair destined to continue the line of ascent which evolved into man himself.
(62:3.13) Modern man and the simians did spring from the same tribe and species but not from the same parents. Man’s ancestors are descended from the superior strains of the selected remnant of this mid-mammal tribe, whereas the modern simians (excepting certain pre-existent types of lemurs, gibbons, apes, and other monkeylike creatures) are the descendants of the most inferior couple of this mid-mammal group, a couple who only survived by hiding themselves in a subterranean food-storage retreat for more than two weeks during the last fierce battle of their tribe, emerging only after the hostilities were well over.
(62:4.7) Thus it was that the dawn mammals, springing from the North American lemur type, gave origin to the mid-mammals, and these mid-mammals in turn produced the superior Primates, who became the immediate ancestors of the primitive human race. The Primates tribes were the last vital link in the evolution of man, but in less than five thousand years not a single individual of these extraordinary tribes was left.
(63:1.4) The decision of Andon and Fonta to flee from the Primates tribes implies a quality of mind far above the baser intelligence which characterized so many of their later descendants who stooped to mate with their retarded cousins of the simian tribes. But their vague feeling of being something more than mere animals was due to the possession of personality and was augmented by the indwelling presence of the Thought Adjusters.
(64:1.1) Primitive man made his evolutionary appearance on earth a little less than one million years ago, and he had a vigorous experience. He instinctively sought to escape the danger of mingling with the inferior simian tribes. But he could not migrate eastward because of the arid Tibetan land elevations, 30,000 feet above sea level; neither could he go south nor west because of the expanded Mediterranean Sea, which then extended eastward to the Indian Ocean; and as he went north, he encountered the advancing ice. But even when further migration was blocked by the ice, and though the dispersing tribes became increasingly hostile, the more intelligent groups never entertained the idea of going southward to live among their hairy tree-dwelling cousins of inferior intellect.
(64:4.5) In these times the Siberian glacier was making its southernmost march, compelling early man to move southward, back toward the lands of his origin. But the human species had so differentiated that the danger of further mingling with its nonprogressive simian relatives was greatly lessened.
Related research
Original research report referred to in the Phys.org article of February 25, 2016:
Ancient chimpanzee ‘Adam’ lived over one million years ago, research reveals by University of Leicester
Chimpanzees have an ancient common ancestor—or genetic ‘Adam’—that lived over one million years ago, according to University of Leicester geneticists.
In a study, which was funded by the Wellcome Trust and published in the journal Genome Research, the research team led by Professor Mark Jobling from the University of Leicester’s Department of Genetics determined the DNA sequences of a large part of the Y chromosome, passed exclusively from fathers to sons, in a set of chimpanzees, bonobos, gorillas and orangutans.
The study also looked at mitochondrial DNA (mtDNA), passed from mothers to offspring, in the same set of animals.
This allowed the construction of genealogical trees that could be compared between species and subspecies – and helped the researchers to discover that the genetic ‘Adam’ for chimpanzees lived a remarkable one million years ago.
Dr Pille Hallast from the Department of Genetics, lead author on the paper, explained: “The ancestor of a Y-chromosome family tree is sometimes called ‘Y-chromosomal Adam’. We can compare the ages of ‘Adams’ between the species. For humans the age is about 200 thousand years, while for gorillas it’s only about 100 thousand years. Thanks to two chimps in our sample, Tommy and Moritz, chimpanzees have an amazingly ancient ‘Adam’, who lived over 1 million years ago.
“The Y chromosome tree for gorillas is very shallow, which fits with the idea that very few male gorillas (alpha males) father the offspring within groups. By contrast, the trees in chimpanzees and bonobos are very deep, which fits with the idea that males and females mate with each other more indiscriminately.”
The project’s leader, Professor Mark Jobling from the University of Leicester’s Department of Genetics, added: “It’s interesting to compare the shapes of the trees between humans and our great-ape relatives. Considering both Y chromosome and mitochondrial DNA trees, humans look much more like gorillas than chimps.
“This suggests that over the long period of human evolution our choice of partners has not been a free-for-all, and that it’s likely that humans have practiced a polygynous system – where a few men have access to most of the women, and many men don’t have access – over our evolutionary history as a species. This is more like the gorilla system than the chimpanzee ‘multimale-multifemale’ mating system.”