Showing posts with label fossils. Show all posts
Showing posts with label fossils. Show all posts

Saturday, June 2, 2012

Ancient Cuttlefish Ink

Follow this link to a summary of exciting recent research in which the ink of a 160-million-year-old fossil cephalapod was found to be intact. Here's the important bit:
The finding -- in an extremely rare case of being able to study organic material that is hundreds of millions of years old -- suggests that the ink-screen escape mechanism of cephalopods -- cuttlefish, squid and octopuses -- has not evolved since the Jurassic period, and that melanin could be preserved intact in the fossils of a range of organisms.
Of course, my take on this discovery is slightly different than that of most of the folks involved in it. I share their excitement at the truly astonishing half of this--it is wonderful that this pigment could be so well-preserved from so long ago as to be susceptible to analysis. This analysis has already led to valuable insights, and the success in this particular case offers hope that other compounds may be preserved and open to testing from organisms that have long ceased to walk the Earth (er, swim the planet's seas).

The other aspect of this is the recognition that this inky compound is identical to that of modern cuttlefish, that, as the study's coauthor John Simon has it,
It's close enough that I would argue that the pigmentation in this class of animals has not evolved in 160 million years. The whole machinery apparently has been locked in time and passed down through succeeding generations of cuttlefish. It's a very optimized system for this animal and has been optimized for a long time.
This seems to be an unexpected result to the evolutionists involved, but it is, frankly, completely in line with all other relevant evidence and thus no surprise to those who have not been misled to embrace evolutionism.

Truly, this system (not only the inky compound but the entire set of related anatomy, physiology, and behavior) is--and always has been--optimized. Indeed, it would be more accurate to say that having such a system is--and always has been--a part of what it means to belong to this group of organisms. To put it in empirical terms, there is no evidence that there ever existed squids with partial ink-screen systems; nor is there any evidence that any cephalod species ever lost its ink-screen system. The really interesting question is this: why would any rational person expect to find any evolution in such a system (as the researchers quoted clearly did)? And the answer is that they have been indoctrinated with a world-view--evolutionism--that has no basis in evidence or reason.

Today's squid--just like the squid of Jurassic times--arose fully-formed, fully-adapted for its time on Earth and its role in the ecology of which it is--or was--a part. The default understanding (throughout human history, and certainly throughout Western history for which we have the record) of such adaptation is a teleological one, one of design. It is only within the last 160 years that it has become popular to deny design and purpose as the explanation for such optimization and adaptation. And the price for such denial is great: it involves both the need to ignore the actual evidence of the fossil record in favor of a mischaracterization thereof, and it involves ignoring the top-down approach to studying organisms that makes anatomy, physiology, taxonomy (and virtually every other discipline) reasonable.

Simply put, the only reason these researchers could be surprised that an optimized system is found both in ancient cephalapods and modern ones is because they have been taught to view science in a design- and purpose-less way (that is, through a neo-Darwinian lens) that flies in the face both of evidence and reason.

Tuesday, January 5, 2010

Transitional Forms

Not infrequently I come across the question, “What about the evidence for transitional forms? Hasn’t science proved that transitional forms exist, thereby validating Darwinian evolution?”

I understand why people might believe this to be the case. The claim that science has found transitional intermediates in the fossil record is taught in schools and universities throughout the land, and is made frequently and loudly by scientists and by the media, seemingly with the authority of evidence behind them.

But this claim has no basis in evidence, but instead is made solely because it is a fundamental and necessary prediction of Darwinian evolution.

To understand the issue, let’s take a big-picture, historical look at it. The real conflict is between two explanations for the diversity of life on Earth. The Darwinian view (or its modern synthesis, generally known as neo-Darwinism) is one. The other—the one held by all the biologists, anatomists, physiologists, and paleontologists of Darwin’s day, and the one Darwin intended to replace—I’ll call typology. Typology sought to explain—and did a very good job of explaining—the two most important characteristics of living things, which are their similarities and their differences. Biologists long knew that all life shared certain similarities, and that different groups of living things shared even more similarities with one another than with species outside their group. The typological explanation for the similarities among living things was (and is) that all things were created—and designed to fulfill their role—by the same Creator.*

But groups of living things exhibit stark differences as well. Indeed, the life forms (extant and extinct) identified by Darwin’s time fell rather neatly into groupings—“types”—that were separated, in many cases by rather large gaps. Thus, mammals all share characteristics that set them apart from birds or reptiles, and bats all share characteristics that set them apart from rodents. Typology said (and says) that gaps exist because the hypothetical things in-between (the half-reptile, half bird or the half-rodent, half bat) are nonsensical and non-functional.

Darwin, on the other hand, postulated that those gaps have been populated throughout life’s history by other living things—transitional intermediates. And on his view, there would have to have been not just one or two such forms bridging the apparent gaps, but that
the number of intermediate and transitional links, between all living and extinct species, must have been inconceivably great.
He knew that no such transitional forms were known at that time, but then paleontology was a relatively young discipline in Darwin’s day. He wrote that the fossil record was
the most obvious and gravest objection which can be urged against my theory [and the reason] all the most eminent paleontologists… and all our greatest geologists… have unanimously, often vehemently, maintained the immutability of species.
So a prediction central to the verification of his theory was that further fossil digging would uncover a great many of these “inconceivably great” number of transitional forms.

For the ensuing 150 years, the history of paleontology has been primarily a search to find these forms predicted by Darwin, the evidence that would validate his theory. What has been the result? Scientists have uncovered hundreds of millions of new fossil forms. Unfortunately (for Darwin’s theory), they have invariably fallen into one of two categories—they have either fit into a type already known to science, or they have represented yet a new type, one not transitional to known types, but rather requiring yet another exceedingly vast number of transitional forms to link that type to other known ones.

Contrary to the educational and media misrepresentation, here’s the true situation as described by arguably the preeminent paleontologist of our generation. Harvard’s late Stephen Jay Gould called
the extreme rarity of transitional forms in the fossil record… the trade secret of paleontology.
His colleague, Niles Eldredge, concurred:
We paleontologists have said that the history of life supports [the story of gradual adaptive change], all the while really knowing that it does not.
Stephen Stanley, commenting on research from Wyoming’s Bighorn Basin—where a continuous record of deposits covering millions of years led paleontologists to expect evidence for transitional forms—wrote that
the fossil record does not convincingly document a single transition from one species to another.
So the central evidentially-based prediction made by Darwin has roundly failed. That it continues to be claimed today that science has documented transitional forms has nothing to do with evidence and everything to do with the centrality of these forms to the theory. It’s really nothing more than a group wish-fulfillment exercise on the part of those who want Darwinism to be true.


* I’ll discuss in one of the next posts why typology still does a better job than neo-Darwinism of explaining the similarities among living things.