Let us grant, for the moment and for the sake of argument, AIG's claim that the skull sizes of Homo erectus fall within the range of modern humans. When AIG wrote that, they were following the approach of Lubenow, who claims that the range of brain sizes in modern humans goes down to about 700 cm3 (compared to about 1350 cm3 for the average modern human). Homo erectus skulls, which have sizes above 700 cm3, are therefore humans, and other hominid skulls such as those belonging to Homo habilis and australopithecines, which all fall under 700 cm3, are apes of some sort. But this means that by AIG's own chosen criteria, the Dmanisi skulls are not human. The two smallest of the skulls have sizes of 650 cm3 and 600 cm3, which AIG and Lubenow have hitherto considered to be outside of the human range. So, another question for AIG: if the Dmanisi skulls are H. erectus, and erectus skulls are "within the range of people today", could they please provide some evidence of modern humans with similar brain sizes? It should be pointed out that it's not only the small brain sizes which show the Dmanisi hominids aren't modern humans. Both the skulls and skeletal bones are primitive even by Homo erectus standards, and have a number of features reminiscent of Homo habilis:H. erectus was smaller than the average human today, with an appropriately smaller head (and brain size). However, the brain size is within the range of people today and studies of the middle ear have shown that Homo erectus was just like us. Remains have been found in the same strata and in close proximity to ordinary Homo sapiens, suggesting that they lived together.
— Answers in Genesis
The bones are so primitive that a few researchers aren't even sure they are members of Homo. "They are truly transitional forms that are neither archaic hominins nor unambiguous members of our own genus," says paleoanthropologist Bernard Wood...
— Gibbons 2007
Returning to the "for the sake of argument" concession above: it is not true, in any meaningful sense, that normal modern human brain sizes go down to 700 cm3. Lubenow says (pp.127-8) that "Modern humans have a cranial capacity range from about 700 cc all the way to up to about 2200 cc.", but his sole evidence for this is a quote from another book that says "In fact, there are many persons with 700 to 800 cubic centimetres" (Molnar 1975, cited on p.309 by Lubenow). The smallest actual human brain size Lubenow can find cited anywhere is 790 cm3. So saying, as he did in the first edition of his book (p.162), that the habiline skull ER 1470, at 750-775 cm3, is "well within the normal human range" is a wild exaggeration. Even if you could find modern human brains that small, they would be incredibly rare. For all practical purposes, modern human brain sizes range from 900 cm3 to 2000 cm3. The anthropologist Ales Hrdlicka measured 12,000 skulls in the U.S. National Museums collections, and the smallest brain size was 910 cm3. Another 19th century study of 600 skulls found a minimum value of 950 cm3. (For more on this topic, read my webpage Creationist Arguments: Brain sizes.) And, it is certainly not true that H. erectus has "an appropriately smaller head (and brain size)" than modern humans. H. erectus skulls are much smaller than those of equivalently-sized modern humans. The Turkana Boy Homo erectus skeleton belonged to a tall young boy who would probably have grown to around 182 cm (6 feet) in height, but his estimated adult brain size was only 910 cm3, about the size of a 3 or 4 year old modern human child. Quite a few other erectus skulls, particularly the older African ones, are 850 cm3 or smaller. Lordkipanidze et al 2007 estimate that the Dmanisi hominids weighed between 40 and 50 kg (88 and 110 lbs) and were between 145 and 166 cm in height (4'9'' and 5'5"). This is smaller than most modern humans but by no means all of them, and it is larger on average than pygmies. Yet pygmy brain sizes average at least 1150 cm3, about 85% that of average-sized humans, while the Dmanisi hominids have brain sizes between 60% and 45% that of an average modern human. As you'd expect from the above data, the encephalization quotient (a measure of brain size compared to body size) for the Dmanisi hominids and the Turkana Boy is well below that of modern humans (6.3):
AIG is correct in saying that the middle ear of Homo erectus was just like ours - not surprising, since, like us, they were obligatory bipeds. (The middle ear contains the semicircular canals which are used in balance and orientation.) As for AIG's claims that the bones of Homo erectus and Homo sapiens are found together, this presumably relies upon the tables found in Lubenow's book which show extensive temporal overlap. One problem is that Lubenow counts as erectus many skulls belonging to fairly recent sapiens, mostly of Australian aboriginal specimens. Some of these are quite atypical compared to the average modern human, but no qualified anatomist (and no, Lubenow is not one) has ever classified them as erectus. Another problem is that Lubenow arbitrarily assigns to H. sapiens many fossils which either belong to H. erectus or other species, or are not readily identifiable. But the biggest problem is that Lubenow claims that the coexistence of H. sapiens and H. erectus disproves evolution, because an ancestor species cannot coexist with its descendant species (p.120). This is such a pathetic argument that I'm not even going to bother rebutting it; instead I'm going to direct you to AIG's rebuttal of it. Yes, you heard right. The central argument used by the flagship creationist book on human evolution is so feeble that Answers in Genesis has disowned it - even though they enthusiastically promote that book. References Gibbons, A. (2007): A new body of evidence fleshes out Homo erectus. Science, 317:1664. Lieberman D.E. (2007): Homing in on early Homo. Nature 449:291-292. Lordkipanidze, D., Jashashvili, T., Vekua, A., Ponce de Leon, M. S., Zollikofer, C. P., Rightmire, G. P. et al. (2007): Postcranial evidence from early Homo from Dmanisi, Georgia. Nature, 449:305-310. Lubenow M.L.: Bones of contention (2nd edition): a creationist assessment of human fossils, Grand Rapids,MI:Baker Books, 2004.Combining cranial and postcranial dimensions, the encephalization quotient for the Dmanisi individuals is in the range of 2.6 to 3.1, which is at the lower end of estimates for KNM-WT 15000 (2.7-3.8) and more comparable to H. habilis (3.1) and australopiths (2.4-3.1).
— Lordkipanidze et al 2007
44 Comments
Stanton · 2 December 2008
Ah, the inconsistency of Creationists...
On the one hand, thanks to their incompetent fact-checking, they make themselves look like idiots. On the other hand, creationists feel that they are above trifling piffles like peer-review.
Or fact-checking.
tresmal · 3 December 2008
"(In a nutshell, Casey Luskin of the DI attempted to argue that the Dmanisi hominids were apes, an argument that is untenable for any number of reasons)."
There's no way they could be apes, they're clearly mammals!
Wheels · 3 December 2008
Up to their usual monkey business, I see.
Erasmus, FCD · 3 December 2008
Nice fisking. When you get AIG and IDiots fighting each other it's like a tard fest to the death. Haven't they ever read the Wedge?
Flint · 3 December 2008
OK, I don't get it. My reading has always been, homo sapiens falls spang in the middle of the ape clade. We are the ape's ape. We epitomize essentially everything that distinguishes an ape from a monkey (much less everything else).
So what, exactly, is the issue here? Is it a dispute about the direct lineage which led to our species, as opposed to branches of that lineage which did not, and died out? Is it a dispute about distinguishing hominids from hominans? Seems pretty hazy and not real conducive to the sort of black/white distinction being discussed, where current humans are white and all extinct members of that bush are, well, some degree of less white but the jury is still out on HOW MUCH less, and in what ways.
So it would seem that Luskin and AiG are disagreeing over a distinction that may not exist even in principle. Which renders this a dispute about angels on pinheads - you have to buy into a bunch of arbitrary and unsupportable context before this dispute even begins to make sense.
eric · 3 December 2008
Cage match under the big tent!
The pygmy comparisons are interesting. While their stature is obviously genetic, just bringing it up makes me curious about the relationship between diet (which can greatly influence body size) and brain size.
fnxtr · 3 December 2008
Venus Mousetrap · 3 December 2008
The DI making a long-held creationist argument? How dare we call them creationists!
MememicBottleneck · 3 December 2008
Henry J · 3 December 2008
So they wind up with a bone to pick with each other, to all in big tents and purposes.
Flint · 3 December 2008
jackstraw · 4 December 2008
"I accept that you may be descended from a ape; I can even accept that I may be descended from a ape; but I defy the man to state that General Robert E. Lee is descended from a ape."
Gen'l George Pickett
Dave Luckett · 4 December 2008
Gen. Pickett, I understand, had the misfortune to be personally present at the charge that bears his name, and had been put there by order of Gen. Longstreet, vice Gen. Lee. If all of them had not evolved from apes, but had remained as such, none of them would have been in that unpleasant position.
Regrettably, evolution is blind. Among other adaptations, apes evolved larger brains. Given time, they produced complex technologies, like gunpowder, minie balls and efficient field artillery. They also produced ethical systems that say both that it's wrong to kill people and also that killing people is acceptable, even admirable, in the line of duty. This allows the seeming paradox of an intelligent, kindly, ethical human being who slaughters thousands of his fellows while shedding the occasional bitter tear over it, and by that act regarding himself - and being regarded by his fellows, even the ones he kills - as decent and upstanding, all without the slightest feeling of hypocrisy.
Apes couldn't do that. "Descended from apes" is indeed a correct description of our lineage.
MememicBottleneck · 4 December 2008
eric · 4 December 2008
Stanton · 4 December 2008
eric · 4 December 2008
DaveH · 4 December 2008
iml8 · 4 December 2008
iml8 · 4 December 2008
stan · 4 December 2008
Uh, pardons me, but I iz an ignerent creationism and pardon my stupidness but will you reel smarts peeple point my ignerent azz to ware yu had evolved 1 single simpel (lyk me) cel what that deevides...in any ov yor phancy laborortories? Yuz make the amino azid and sez it be buildum blok...so buildum cel.
phantomreader42 · 4 December 2008
Jim · 4 December 2008
Off-topic and provocative trolling comments will be (and have been) deleted.
DS · 4 December 2008
Thanks Jim. Eternal vigilance is the price of freedom. Somebody famous once said that, I just agree with it.
Henry J · 4 December 2008
Yeah, but it's too bad that vigilance has to be expended on our freedom from breathtaking inanities.
Henry
Wheels · 4 December 2008
Stephen Wells · 5 December 2008
@Stan: the suggested protocol is take a large number of simple organic reagents on a hot young planet (Refer to the centrefold of the Hot Young Planets special edition of PlayAstronomer) and leave them for several tens of millions of years at least. Have fun.
Jim · 5 December 2008
This blog post is not about abiogenesis, so comments on that topic are banned from now on, as is trolling.
Science Avenger · 5 December 2008
Three cheers Jim. Keep it up.
Michael Dowd · 5 December 2008
Great post, Jim.
I recently posted two responses to creationists myself:
"Even Rocks Evolve!": http://thankgodforevolution.com/node/1525
"Creationist Confusion / Evolution as Meaningful, Inspiring Fact":
http://thankgodforevolution.com/node/1520
Keep up the great work!
~ Michael
http://ThankGodforEvolution.com
William Cody Bateman · 6 December 2008
So, where does one's conscience originate? Hmmm...
Jim · 6 December 2008
eric · 8 December 2008
JimF · 11 December 2008
dan · 13 September 2009
Why don't you PALEOTARDS try reading the Bible, maybe study the scientific parts? Did you know a man named Isaiah spoke about a "circular" earth thousands of years before "science" found out? Did you know it was written in the Bible thousands of years before "science" found out: blood (plasma)is universal, the water cycle, why it rains, vitamin K??? The fossil record strongly supports the Biblical principal of reproduction after its kind, not evolution of one KIND turning into another. Fossil graveyards are mass burial sites throughout the world that are literally packed with fossilized animals from different climactic zones, The billions of fossils do not show evolution. It clearly is a great memorial to the sudden mass extermination of life from the antediluvian world around 2300 B.C, the Genesis flood.
Polystratic trees are fossil trees which extend through several layers of strata there is a fossilized Lepidodendrid tree in found in Tennessee, how did this happen. TRY reading the Bible and study the scientific and creation side of it. I did, now I am among those who will be raised on the last day to be with the Lord. I pray for all those who think that when they die they go no where but in the ground, the blind leading the blind.
Dave Luckett · 13 September 2009
There is no reasoning with the unreasonable; nevertheless, let us try.
The Bible as we now have it predates science by seventeen hundred years or so; they have nothing to do with each other.
Isaiah did speak of a circular Earth. I take it that you do understand the difference between "circular" and "spherical"? He thought of the Earth as a plate suspended in a great ocean, with the sky a dome above it.
The rain cycle occurred to many other early peoples than the Hebrews. The Maya, for example. I have no idea what the remarks about blood and vitamin K mean.
Your statements about the fossil record are wildly incorrect. That record plainly shows the slow replacement of one set of living things with completely different sets, slowly succeeding one another in a more-or-less continuous process (although with several great extinctions). It shows slow but enormous change over deep time.
There are now many full sets of transitional forms - fish to tetrapod, reptile to mammal, dinosaur to bird, hoofed animal to whale, hominid to human. These occur in precisely the order predicted by evolution, from least like today's animals to most like them, over time. This evidence powerfully supports the idea of common descent.
Many strata are made up of fossil animals, many times more fossils of many more animals than could ever exist on Earth at any one time. These strata lie evenly, not in great swathes or heaps, as one would expect from rushes of water, and they lie in multiple even layers, one over another. They could not have been laid down by one flood. They could only have been slowly accumulated over millions of years as land was covered by water that receded and then was covered again, and the sheer number of fossils can only be accounted by huge numbers of generations.
"Polystrate" trees are fossilised trees that pushed roots through several different strata in river deltas and shorelines when it was soft sediment. Later, the sediments hardened into sedimentary rock, with the structures of the tree roots preserved. (The same is seen with animal burrows.) They're easily explained, and the explanation has been known since the 1880's.
I have read the Bible, several times. There is no rigorous science in it, though there is often a shrewd commonsense knowledge of nature. Specifically, there is no science in its account of creation, which is what you would expect of the people who wrote it. They simply lacked the data. You have no such excuse. The facts are easily available to you, if you have the goodwill to seek them out.
I hope that your hopes for salvation will be fulfilled. I would, however, point out to you that if the Lord your God gave you your eyes and your brain, your understanding and your intellect, and the Parable of the Talents is any guide, He expects you to use them. You tell me to read the Bible, which I have done. But if you wish to be taken seriously, you will need to study more than the Bible to arrive at any real knowledge of geology. Try doing that.
NJ · 13 September 2009
OK, whose turn was it to make sure dan got his meds?
Stanton · 13 September 2009
Ken · 13 September 2009
Shall we stump Dan with that one simple question that no Creationist has ever been able to answer?
Dan ... define exactly what a 'Kind' is.
While Dan is busy Lying for Jesus, Let's remind him, as Dave said in different terms, that he is doing a severe dishonour to his god.
By not observing and accepting the facts that are all around him he is effectively ridiculing the very god he thinks he's defending. By blinding himself with the lies, contradictions, and ignorance of the bible, Dan has limited himself to seeing only a tiny fraction of the real world supposedly setup by his god.
Now being ominpotent, I doubt Dan's god gives a rats ass what Dan or anyone else really thinks, but if that god does care, I suspect he will care much less for those who promote blind and violent ignorance rather than for those who dive deep into the true details and facts of his glorious creation.
In other words Dan, if your god does exist, he'll have us at his side talking about all the great details of his creation, about what we figured out and what we were still trying to learn, while you're down below burning for eternity for not giving him enough credit, for not believing your god could have created a universe in which life spontaneously formed from chemicals and evolved into sufficient complexity to be able to contemplate it all.
chris · 3 January 2010
Thanks for the article Jim. I am not a hard-line evolutionist, although I am happy to accept that it might be true. I am still thinking it through (as of 2009). I have read a lot from the few different sides of the debate, and have not been able to come to a clear conclusion just yet. But I respect the fact that many have. The two general sides (evolutionists and non-evolutionists) of the debate seem to have good arguments and counter-arguments. While it might not go down too well on this post, I do believe there is some excellent scholarship on both sides of the debate.
While I didn’t quite agree with everything you said in your article, it has provided some good food for thought. So thank you for that. The only comment I would make (which I’m guessing you’re already aware) is that some of the points you made (e.g. disagreements among creationist, suggesting their incompetence) can also (and has been) levelled against evolutionists (e.g. disagreements about the mechanism for biological macro-evolution). But this is just a small point.
If it’s OK for me to also say, I was a little disappointed by some of the comments made by other people responding to your article. I thought that many respondents were intent on attacking the person rather than the issue at hand. I’m sure people are just venting their frustration at the other side, but to an outsider, it really does look less than intellectual, and doesn’t fair well for their credibility. I’m sure some non-evolutionists are guilty of the same thing.
I only wish the debate was in a more humble and respectful manner from both sides. Humility breeds teachableness, which in turns helps us to see the truth more clearly. Arrogance is often blinding.
I’m just glad you didn’t stoop to this level too much in your article. Perhaps if you could disassociate yourself from some the comments from some that are clearly slanderous, it would encourage people to speak in a more respectful manner.
fnxtr · 4 January 2010
Humble and respectful like Salvador Cordova, for example? (chuckle)
stevaroni · 4 January 2010
curran · 25 March 2010
I don't understand why there's even a debate. Flat-earthers are ridiculed and listened to only for their entertainment value. Creationalists are (or should be) in the same canoe. On the one hand you have science, on the other you have romantic idealism and its attempt to rewrite factual history.
Stanton · 25 March 2010