For the purpose of this summary
presentation I have left out the story, as it is understood today, of the
origin of our universe, our solar system, the Earth, life upon it and the
subsequent evolution of life - as
fascinating as these topics are - to begin with the origin and emergence of Homo.
Those of you who understand the importance of these former topics, as the
framework for understanding cultural evolution, are referred to the many
textbooks in astronomy and subatomic physics. Among them my own monograph “New
Perspectives in Physics, 1999, Jason W. Smith, Premier Books, Boise, 160
pp.” for a new account of the Big Bang, and the creation of the fundamental
particles that constitute force and matter and their antimode.- And, of course,
there are many excellent textbooks in palaeontology and geology which will
bring you up to date on modern conceptions of the origin and evolution of life
on Earth and the plate tectonic history of the Earth itself.
Because of space and time limitations I
have to skip over these now fairly well understood stages in the origin and
evolution of life on Earth, before and after the advent of hard-part fossils,
even though the entire matter is directly germane to the way in which the
biological foundation for “culture” came about. Suffice it to say that this
evolution created the parameters upon which a, new, “third” form of matter came
into existence. What anthropologists call “culture.”
Serious students must always keep in mind that to understand how cultural
“software” functions, one must also understand first, the biological “hardware”
upon which culture is based. So, the evolution of invertebrate and vertebrate
life is not a peripheral subject. Is is simply beyond the scope of this
summary. The requirements of compact presentation are best served when we begin
by coming directly to the evolution of the Order of Primates. For practical
purposes this begins with the extinction of the dinosaurs, and the creation of
vast new ecological niche opportunities, following the asteroid impact some 65
million years ago.
The dialectics of human sociocultural
evolution require an understanding of the dialectics of human biological
evolution so I want to begin with some commentary on our earliest relatives and
how the biological where-with-all came into existence to support culture. Then
we shall proceed directly to the key questions of causality and process in the
evolution of cultural matter - i.e., people and their humanity.
Preparation for the Human Era of Necessity
We know there have been extraterrestrial
contacts of the asteroid impact category, and these have created a series of
sudden wrenching changes in the course of the evolution of life on Earth. Also,
at the end of the pre-Cambrian there was a mass extinction of still uncertain
cause (perhaps the global snowballing of Earth). Another event of geologic
proportions occurred at the end of the Palaeozoic when Siberia
was literally split apart as a dome some 1200 miles
across began to build in its center. Out of that dome came perhaps the greatest
outpouring of mantle rock (as lava) in the Earth’s history occurring over many
tens of thousands of years, leaving behind 60 mile
wide and 1000 mile
long seismic fissures in the surface. After the collapse of oxygen levels and
the emergence of a new fauna (dinosaurs, birds, mammals) we have the Mesozoic
and its Age of Dinosaurs (Triassic, Jurassic and
Cretaceous).
The most famous of all the catastrophic
changes is the one defining the end of the Mesozoic, caused by the asteroid
impact centered near contemporary Merida,
Yucatan, Mexico.
- And, with it came the extinction of the dinosaurs and all forms of animal life
weighing more than about 60 pounds
in adulthood on land, and huge numbers of species of plant and animal life in
the oceans. – And a dramatic renovation of the botanical landscape of the entire
world.
What is most important to us is the fact
that the insectivore/prosimian complex of tiny animals radiated throughout the
world in the Palaeocene. The palaeocene is the first geologic period in the
Cenozoic (or most recent geologic epoch.) These small animals, of the size of
prairie dogs, filled the ecological niches left after the sudden massive
extinction of so many life forms 66 million years ago. If not for that the
carriers of culture might have been the dinosaurian “raptors.”
- And, it is time to memorize the
geological periods below. Also, to put some landmark sociocultural
features firmly in your memory bank. I suggest these, from most recent
to the most ancient:
~66
million Cretaceous <-----------ends
with asteroid impact at Merida, Yucatan.
Jurassic
Triassic
The Palaeozoic Era
! -----------Siberia
split in half by mantle eruption
Permian
Pennsylvanian
Mississippian
Devonian
Silurian
Ordovician
Cambrian
Pre-Cambrian
Origin of the Earth ~4.6
billion years ago.
The dialectics of primate biological evolution feature
contemporary natural selection producing biological alternatives, as usual, for
eventual adaptation to future changing environmental conditions. This time,
however, emerging in the primate line is the potential for the ability to use
an entirely new way of adaptation which, in form, is the dialectical opposite
of traditional natural selection. (Those primates that make the entire trip
outlined below become human. Those who do not make the trip will not get
further than where they are, more or less, in the evolutionary schema of
primate speciation.) Now adaptation takes the form of “controlling”
environmental change. This new way of adaptation is what we call the “cultural”
way in anthropology. Thus you can see why we can say cultural matter is the
“third form” of matter (the physical and biological forms preceding). - And, its
precursor requirement is an expanded (human) brain capacity of the right type
that is, organized in a special way. Currently substantial progress has been
made in isolating those human brain genes that are accelerated in their
evolutionary change rate over those of the chimpanzee. But, however this
biological factual foundation is laid, so to speak, human evolution of the
biological type will be seen to be decisively changing course because of the
evolution of a complex of behavioral proto-traits. The behavioral traits
include collective tool use and defense, and thinking and symbol-use. The
complex is acting as the prime director for natural selection; not natural selection
operating directly for genetic features of fleetness of foot, keenness of
eyesight, etc. But natural selection for bigger and better
brains, in the sense of abstract thought capability. Brains that allow
cultural evolution to take over the direction to be taken in the future
evolution of Homo sapiens as a species because this thinking,
collective, tool using proto-activity, is what is giving them the ability to
survive and reproduce consistently effectively. This is the first key for you
to understand, and this is a rather well agreed upon anthropological principle
(if not always well explicated.)
During the Palaeocene, and Eocene, the consequences of
a life in the bushes and trees brought about a new kind of prosimian. You want
to remember that the Palaeocene begins immediately with the wreckage of this
planet created by the asteroid impact. The foliage that survived, mutated, and
spread throughout the world, was quite different than that preceding it. Now
there were a great many small bushes and trees of all sizes and grass (there
were antecedent grass forms before the asteroid impact but they were few and
far between). In this environment are our earliest ancestors among the
primates, and they flourished.
This is the phase called the arboreal
adaptation period in physical
anthropology. Our basic body plan emerges at this time. Hands and feet
that are prehensile, arms and legs, binocular vision and a rotating neck,
expanded cerebral cortex, ability to assume upright posture, and so forth.
Recently discovered early Palaeocene
fossils from China
show a chipmunk sized mammal coexisting with giant 7 foot
tall Carnivorous birds extant over most of the Earth by 9 million years
after the asteroid impact. These tiny mammals had clearly developed primate prehensile hands.
One of the early fossil prosimian primates is
an early Lemur called plesiadapis. These arose after Tree Shrews, which
still had claws instead of flat nails. Other than a few of these prosimians,
all other primates lost claws in favor of flat nails.
We see the change of the location of
the eye orbits beginning to occur, so that binocular stereoscopic vision
replaces the lateral orbit monocular eyesight of the insectivores and the lower
prosimians. But flat nails, precision grip, and binocular vision, are
simply associated features of arboreal adaptive anatomy. What is really
important is that there is an enlarged cerebellum associated with this increase
in the visual and motor cortex. These traits were obviously caused by the
rigorous natural selection that accompanied life in the trees and high bushes.
Why is this important? Because abstract
thought appears initially among primates as a product of the same part of
the brain as that responsible for motor control in precision manipulation and with
vision.
The Family Adapidae is the second
level of fossil Lemur and is important to us because it shows the eyes truly in
a forward position, meaning that the transition to binocular vision was
complete. - And the fossil family Northartidae shows excellent prosimian
to monkey characteristics by middle Eocene times.
So, the brain was expanding and in
the area most important to our analysis - that associated with abstract
thought.
Of course, not all individuals in a
species continue to evolve. For as long as there is no challenge to their
genetic make-up they are perfectly free to continue as they are; they will
survive until some great environmental change comes along that they can not
tolerate.
However, since erroneous DNA duplication
keeps throwing up variation in the form of abnormal individuals, each species
will generate aberrant forms; some of these will prove adept at living within
some particular environment. Some will not. When environmental change does come
there is a broader spectrum of responses proposed by biology to the
dispositional effect of nature. Thus, the increasing reliance upon the new and
improved primate brain led onward and upward among some individuals to monkeyhood.
Fully developed fossil monkeys have been
excavated in Egypt
and are now known from many localities. These are called Aegyptopithecus.
They have the best organized brains of any animal then extant, and are by far
larger than the lower prosimian primates from which they evolved. We find them
in Oligocene times. These are the fossil Old World Monkeys.
The Old World Monkeys gave rise to the early
Apes. Fossil specimens include the Dryopithecines and the Ramapithecines.
From these kinds of apes emerged the
first human-like primates.
Human-like apes gave rise to ape-like
humans. We call these the Australopithecines!
Brain Changes in Favor of Abstract Thought
The important ball to keep your eye on is brain
reorganization in favor of abstract thought. This is the really important change going on in
the line leading to humanity. Once humans are extant on the face of the
Earth it will be the continuing expansion of the brain to handle culture which
is the most important thing changing.
The split of the hominoid elements out of
the anthropoid ape stock probably occurred between 10 and 7 million years ago.
The term hominoid I use to include the still largely missing fossil data
that links the anthropoid apes to the hominids. There is a lot of sloppy
terminology in both professional and popular literature, but for your purposes
think of hominid as the line beginning with Homo as a genus. So, we
have:
Modern
Humans H. sapiens
Gorillas,
Orang-utans, Chimpanzees
GibbonsArchaic Humans Homo
erectus
Early
Humans {Hominids} Homo australopithecus
Human-like Apes {Hominoids}
Anthropoid
Apes
Monkeys
The hominoid transitional step is not yet very well
known in the fossil record; we have not yet been able to identify stone tools
for them. Although, logically, we must assume they at least used rocks to
throw, cut and crush (in their natural form,) so that we may be able to find
some stones of this sort in sealed and well dated stratigraphic components.
A chart of the overall stages of sociocultural
evolution can be seen on page 316 of this book.