Without wishing to gloss over the lack of a perfect series of fossils showing transition from T rex to turkey, there are enough transitional fossils to substantiate the claim that the process is occurring. The evolution of the horse is very compelling, though Creationists have argued that this is still micro -evolution - it's just a small horse that got bigger.
But the Cetan sequence is definitely a change from a crocodile to fish, (though the 'fish' was of course a mammal) and the queries which our pal Eusebius raised about the transition from teeth to baleen (effectively the irreducible complexity objection) was scuppered by the discovery of a fossil which had evidence of baleen along with the teeth.
Don't let yourself yet trapped, Lionheart, into the creationist quotemining of comments about transitions or other aspects of evolution taken out of context. The people who do that are being dishonest and you have already been shown examples of their dishonesty.
You should be wary of using them to support your argument. I am not going to gloss over the gaps in the fossil record or claim that every single line can be traced with a complete series of fossils. The case for evolution as regards fossils is that the evident development of forms linked to the sucessive laying down of strata in which they are found shouts that they gradually developed in their forms. They were not all made in one go. True, there ought to be transitional forms, and in fact they have now been found, just as Darwin predicted should happen.
It is sometimes claimed that Darwin admitted that there are no transitional fossils.
Quote #2.6
[Re: "lack" of transitional fossils]
But, as by this theory, innumerable transitional forms must have existed, why do we not find them embedded in countless numbers in the crust of the earth?" (Origin of Species, 1859).
"Besides leaving out the context, this is misleading in a subtler way when used for the proposition that there are no transitional forms. Darwin is not talking about the existence or nonexistence of transitionals here, but of an "innumerable" series of finely-graded transitionals linking together all extinct and existing forms. As he says later in Chapter XI of the sixth edition on page 342:
These causes [the imperfection of the fossil record, the limited exploration of the record, poor fossilization of certain body types, etc.], taken conjointly, will to a large extent explain why -- though we do find many links -- we do not find interminable varieties, connecting together all extinct and existing forms by the finest graduated steps. It should also be constantly borne in mind that any linking variety between two forms, which might be found, would be ranked, unless the whole chain could be perfectly restored, as a new and distinct species; for it is not pretended that we have any sure criterion by which species and varieties can be discriminated.
In short, the use of the quote to imply there are no transitionals misstates Darwin's argument, intentionally or out of ignorance. Darwin was not stating that there was an absence of transitionals but, in fact, stated there were "many links." Instead, he was discussing why there are not more transitionals in an easily read pattern of gradual change. As Darwin correctly noted, where the fossil record does not approach "perfection,..."
http://www.talkorigins.org/faqs/quotes/mine/part2.html
So let's take that Darwin quote first. ""If it could be demonstrated that any complex organ existed, which could not possibly have been formed by numerous, successive, slight modifications, my theory would absolutely break down. But I can find out no such case".
What he is saying that, if he could see any animal or plant which was too complext to have developed through the process of mutation/natural selection then his evolution theory would collapse - but he cannot see any organism which could not have developed in that way. In other words, he is dismissing Irreducible complexity before it was even postulated by the ID people.
Before going on, I'll say that my beef is not so much with pointing up the unanswered questions and the ongoing revisions in evolution theory, though (as i suggested above) this really is nit-pickng about the overwhelming overall evidence for a gradual development of all life over geological ages (plus of course the DNA evidence and small but significant examples of natural selection through mutation being found today)
My beef is that they misrepresent what is being said. They Lie, in fact. They try to deceive their readers into thinking that their quotes destroy evolution as a theory when they do not. Even if the intent was to show that evolutionists 9even if they believed evolution) admitted they had no evidence, that too is false. They ommit the parts of the quote that say that they are evidence of evolution, but cannot be definitely linked to any particular other branch.
Let's take the quotes in sequence.
"Dr David Pilbeam came to the attention of the scientific community as being an objective scientist when he wrote an article for Human Nature magazine, June 1978, entitled, ‘Rearranging Our Family Tree’.... He did not believe any longer that he was likely to hit upon the true or correct story of the origin of man. He repeated a number of times that our theories have clearly reflected our current ideologies instead of the actual data.
I don't know where you got this information. It is not good practice to just toss in claims that Dr Pilbeam thinks this or that without giving some way I can check it.
I can show that one comment of his at least is taken out of context:-
"But real experts on the subject are aware that there is no scientific foundation for the claim of human evolution. David Pilbeam, a Harvard University paleoanthropologist, says:
If you brought in a smart scientist from another discipline and showed him the meagre evidence we've got he'd surely say, "forget it; there isn't enough to go on."
This is plagiarized at another anti-evolution site,
http://www.evidencesofcreation.com/tellme21.htm
The same sentence is wrongly attributed to Leakey himself, here:
http://www.thinkreal.org/evquote.htm (broken link)
In this forum, Willowtree has quoted Richard Milton quoting this same statement:
http://www.evcforum.net/cgi-bin/dm.c...&t=368&m=51#51 -->www.evcforum.net/cgi-bin/dm.cgi?action=msg&f=5&t=368&m=51#51">
http://www.evcforum.net/cgi-bin/dm.c...&t=368&m=51#51
So, what is this quote really saying? Let's see the quote in context:
Of the primates, the chimpanzee is man's closest relative, while the two other great apes, the gorilla and orang-utan, are slightly more distant evolutionary cousins. The apes and hominids are collectively known as the 'hominoids'. Biologists would dearly like to know how modern apes, modern humans and the various ancestral hominids have evolved from a common ancestor. Unfortunately, the fossil record is somewhat incomplete as far as the hominids are concerned, and it is all but blank for the apes. The best we can hope for is that more fossils will be found over the next few years which will fill the present gaps in the evidence. The major gap, often referred to as 'the fossil void', is between eight and four million years ago.
David Pilbeam comments wryly, 'If you brought in a smart scientist from another discipline and showed him the meagre evidence we've got he'd surely say, "forget it; there isn't enough to go on".' Neither David nor others involved in the search for mankind can take this advice, of course, but we remain fully aware of the dangers of drawing conclusions from the evidence that is so incomplete.
Fortunately, there is quite good evidence regarding the ape-like creatures that lived over fourteen million years ago [...]"
http://www.evcforum.net/dm.php?control=msg&t=13427
Dr Eldredge [curator of invertebrate palaeontology at the American Museum] said that the categories of families and above could not be connected .
Quote #3.3
[Archaeopteryx is not a transitional fossil]
"Smooth intermediates between Bauplane [body plans] are almost impossible to construct, even in thought experiments: there is certainly no evidence for them in the fossil record (curious mosaics like Archaeopteryx do not count)" - Gould, S.J. and N. Eldredge. "Punctuated equilibria: the tempo and mode of evolution reconsidered." Paleobiology, 3 (1977): 115-151. (p. 147)
Representative quote miners: The Revolution Against Evolution: Archaeopteryx is No Transitional Form and Reason & Revelation: Archaeopteryx, Archaeoraptor, and the "Dinosaurs-to-Birds" Theory
A more complete quote:
At the higher level of evolutionary transition between basic morphological designs, gradualism has always been in trouble, though it remains the "official" position of most Western evolutionists. Smooth intermediates between Baupläne are almost impossible to construct, even in thought experiments; there is certainly no evidence for them in the fossil record (curious mosaics like Archaeopteryx do not count).
It's now obvious that Gould and Eldredge weren't arguing against Archaeopteryx being a transitional form, but arguing that it wasn't an example of a perfectly smooth change between body plans (or "Baupläne").
http://www.talkorigins.org/faqs/quotes/mine/part3.html
Dr Raup [curator of geology at the Field Museum of Natural History in Chicago] said that a dozen or so large groups could not be connected with each other.
Quote #25
"Instead of finding the gradual unfolding of life, what geologists of Darwin's time, and geologists of the present day actually find is a highly uneven or jerky record; that is, species appear in the sequence very suddenly, show little or no change during their existence in the record, then abruptly go out of the record. and it is not always clear, in fact it's rarely clear, that the descendants were actually better adapted than their predecessors. In other words, biological improvement is hard to find." (Raup, David M., "Conflicts Between Darwin and Paleontology," Bulletin, Field Museum of Natural History, vol. 50, 1979, p. 23)
"Now let me step back from the problem and very generally discuss natural selection and what we know about it. I think it is safe to say that we know for sure that natural selection, as a process, does work. There is a mountain of experimental and observational evidence, much of it predating genetics, which shows that natural selection as a biological process works."
http://www.talkorigins.org/faqs/quot...2.html#quote25
Obviously, none of this research is your own. You have lifted it from some creationist site or other. "Before interviewing Dr Patterson, the author read his book, Evolution, which he had written for the British Museum of Natural History." Obviously that wasn't you.
But Dr Patterson [a senior palaeontologist and editor of a prestigious journal at the British Museum of Natural History] spoke most freely about the absence of transitional forms.
...‘. . . I fully agree with your comments on the lack of direct illustration of evolutionary transitions in my book. If I knew of any, fossil or living, I would certainly have included them. You suggest that an artist should be used to visualise such transformations, but where would he get the information from? I could not, honestly, provide it, and if I were to leave it to artistic licence, would that not mislead the reader?
’I wrote the text of my book four years ago. If I were to write it now, I think the book would be rather different. Gradualism is a concept I believe in, not just because of Darwin’s authority, but because my understanding of genetics seems to demand it. Yet Gould and the American Museum people are hard to contradict when they say there are no transitional fossils. As a palaeontologist myself, I am much occupied with the philosophical problems of identifying ancestral forms in the fossil record. You say that I should at least “show a photo of the fossil from which each type of organism was derived.” I will lay it on the line- there is not one such fossil for which one could make a watertight argument."
True enough though missing the context -which is hinted at here:- "I wrote the text of my book four years ago. If I were to write it now, I think the book would be rather different. Gradualism is a concept I believe in, not just because of Darwin’s authority, but because my understanding of genetics seems to demand it."
The awful thing is that this looks very convincing to your case and would worry me, were it not that I know that it has been misrepresented.
" During the lecture a quotation of Dr. Colin Patterson was used to justify the standard creationist argument that 'there are no transitional forms.' Numerous other creationists I have encountered have used the quote,...I decided to get to the bottom of the matter. The quote is from a personal letter dated 10th April 1979 from Dr. Patterson to creationist Luther D. Sunderland and is referring to Dr. Patterson's book "Evolution" (1978, Routledge & Kegan Paul Ltd.). My first step was to read the book. (I believe it is now out of print, but most university libraries should have a copy.) Anyone who has actually read the book can hardly say that Patterson believed in the absence of transitional forms. For example (p131-133):
"In several animal and plant groups, enough fossils are known to bridge the wide gaps between existing types. In mammals, for example, the gap between horses, asses and zebras (genus Equus) and their closest living relatives, the rhinoceroses and tapirs, is filled by an extensive series of fossils extending back sixty-million years to a small animal, Hyracotherium, which can only be distinguished from the rhinoceros-tapir group by one or two horse-like details of the skull. There are many other examples of fossil 'missing links', such as Archaeopteryx, the Jurassic bird which links birds with dinosaurs (Fig. 45), and Ichthyostega, the late Devonian amphibian which links land vertebrates and the extinct choanate (having internal nostrils) fishes. . ."
Patterson goes on to acknowledge that there are gaps in the fossil record, but points out that this is possibly due to the limitations of what fossils can tell us. He finishes the paragraph with:
". . .Fossils may tell us many things, but one thing they can never disclose is whether they were ancestors of anything else."
It is actually this statement which is the key to interpreting the Sunderland quote correctly; it is not possible to say for certain whether a fossil is in the direct ancestral line of a species group. Archaeopteryx, for example, is not necessarily directly ancestral to birds. It may have been a species on a side-branch. However, that in no way disqualifies it as a transitional form, or as evidence for evolution. Evolution predicts that such fossils will exist, and if there was no link between reptiles and birds then Archaeopteryx would not exist, whether it is directly ancestral or not. What Patterson was saying to Sunderland was that, of the transitional forms that are known, he could not make a watertight argument for any being directly ancestral to living species groups."
http://www.talkorigins.org/faqs/patterson.html