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

Tuesday, 21 February 2017

Fossils and Faith


Do you see a neck on this Tiktaalik fossil? Image from


Do you see arms and paws or hands?





Fish hands diagram from here.












Tiktaalik wrist and hand

Do these artist's renderings really show the details of the fossil? Or are they merely what the paleontologist and artist want to be there?


Fossil debunking video.
Under the title “Dinosaur Hoax,” this unnamed young debunker of evolution triumphantly proves in a three-minute video that so-called dinosaur fossils are no more significant than random pieces of smashed-up plaster. You can spackle the bits back together any way you choose, she says; therefore, dinosaurs are a fabrication.
This woman almost has a point. The following images are from Georgia Life Traces. and have been shrunk (but will be somewhat larger if you click on them). Follow the link to see them full size. The first image is captioned, "A rare piece of dinosaur bone that actually looks like a bone..." while the next one is, "You probably spotted the big chunk right away, but how about the smaller ones that tend to blend in with the non-dinosaur-bone rocks around them?" and the third one is of  a negative cast of a dinosaur track. For this latter, I can kind of see it, if I squint right.




How much of paleontology is based on faith? How much, as the speaker on the video asks, is based on the millions of dollars the paleontologists receive*?

I visited Drumheller, Alberta (link to their museum) almost twenty years ago. A paleontology/tourism group was offering to take people into the hills to look for dinosaur fossils. I joined them, had a great time but found  nothing in the ground. We did pass a huge claw that the guide told us was aT-rex foot-claw fossil. The mineral that had replaced the bone was iron and the guide told us such fossils were so delicate that there was no point in carrying it away - it would crumble at the touch. This is nearly the sum total of my personal experience with fossils. Wait. I also have spent time at Craig Leith Provincial Park. There are many fossils from 400+ million years ago there.

So I am certain that fossils are real, which puts me ahead of the woman in the video.

But are those tiny details correct?

After several fruitless minutes, I have given up on trying to find a long video of a glass-walled beehive. I wanted to demonstrate the 'expert's eye'. At university I was required to spend something like ten hours studying such a bee hive. For the first half hour I only saw a squirming mess. In the second half hour I saw one waggle dance (the dance bees use to communicate where a pollen source is). In the second hour, I saw ten waggle dances and in the following hours I saw them every time I looked. We upper year students would sometimes call a freshman student over and ask them to point out a waggle dance. They saw none. Then we would point out the dances one after another that they had missed entirely.

In my home district of Muskoka, there are many beautiful lakes and it is the perfect distance from Toronto so many wealthy families from Toronto and points south have cottages there. I grew up on those lakes and for many summers as a high school and university student, I worked as a carpenter's assistant on the lakes. I remember being out one summer day with another university student, this one from a drier part of Ontario. He asked me about a recurring whine or high pitched hum we heard through the day. Without needing to think about it, I told him that was the hydraulics of a boat's Inboard/Outboard motor adjusting the trim. This was natural and obvious to me and completely new to him.

I do take the pronouncements of paleontologists on faith to an extent. I have difficulty seeing the various bones described in Tiktaalik's neck and fin. And yet, the people who criticize their claims usually haven't spent time with that specific fossil nor can claim to have spent enough time studying fossils in general to have an 'expert's eye'.
A good example of this is mathematician Fred Hoyle's description of archaeopteryx as a fake. He had no background in paleontology and appears to have misidentified modelling rubber as a suspicious chemical that pointed to fraud. The best counter argument for his claim is that at this time, a total of nine archaeopteryx fossils have been found, some with even better feather impressions than the one he examined. There is more at the link.

---
* The question of whether the speaker on the video is sincere or satirical is still open. If anyone cares, paleontologists do not make millions of dollars, ever.

Wednesday, 8 February 2017

The evolution of language

Via The Sensuous Curmudgeon, I read a letter to the editor that was typically terrible but also a good analogy for other arguments against the theory of evolution.
I began the study of linguistics in the autumn of 1968.
After nearly 50 years I can tell you, I still love linguistics. One day as an adult I read an article by a linguist who proposed a theory I had never considered. He suggested if Darwin were true, then language must have evolved from a grunt and a groan into the extraordinarily complex system of syntax, grammar and vocabulary which we speak today.
And if that were true, he continued, logically there must be evidence that somewhere, at sometime, in some place there once was a primitive language. After 50 years in linguistics I can tell you, for certain, there is no such evidence.
First, the claim it is a metaphor for. One thing this article at CreationToday gets right is that there are no simple life forms today.
Any living organism, even a single-celled amoeba, is more complex than the space shuttle!...Most biology textbooks these days teach that all life-forms evolved from “simple, single-celled life-forms.”
There are several things to consider here:
There are no “simple life-forms.” If it is alive—it is extremely complex.
Many single-celled creatures have been observed for thousands of generations with no significant change.
Single-celled creatures still exist and reproduce. Why aren’t any of them evolving?
There are no examples living or fossilized of two-, three-, or four-celled creatures.
After one-celled creatures, the “simplest” animals have about one hundred cells. How did the single-celled creatures become multi-celled? Be sure to ask for specific evidence, not just theories.

Alright, time to look at the letter to the editor and the claim that "[T]here must be evidence that somewhere, at sometime, in some place there once was a primitive language."

Why does the letter writer think that? Do the words from his mouth solidify and exist without human intervention for more than a few seconds? If you are curious about the 'few seconds' bit, I will do him the favour of imagining he speaks in an echo chamber and the words do carry and bounce for some time. But not a minute. Not an hour.

If there was a primitive language, if evolutionists and linguists were right, what does he think we would find? Here are some 'Unattested languages' from North American native peoples -"Several languages are only known by mention in historical documents or from only a few names or words. It cannot be determined that these languages actually existed or that the few recorded words are actually of known or unknown languages."

The key phrase for me is "cannot be determined that these languages actually existed". These names for possible languages can only be a few hundred years old as the words were recorded - possibly in error - by Europeans.

There is no reason to expect any evidence for ancient languages.
---
Alright. On to the Creation Today article and these statements and questions:
1 There are no “simple life-forms.” If it is alive—it is extremely complex.
2 Many single-celled creatures have been observed for thousands of generations with no significant change.
3 Single-celled creatures still exist and reproduce. Why aren’t any of them evolving?
4 There are no examples living or fossilized of two-, three-, or four-celled creatures.
After one-celled creatures, the “simplest” animals have about one hundred cells.
4 There are no examples living of fossilized of two-, three-, or four-celled creatures.  I don't know if this is true. Let's accept that it is. For now. There are also no examples of fossilized passenger pigeons. Fossils are formed when an object is surrounded by a material, typically silt or mud. With time, the object degrades and disappears and other material fills in the gap. This is obvious when looking at fossils of large dinosaur bones. But a dinosaur bone is much larger than a speck of silt. A creature of less than ten cells size is not much bigger than the silt surrounding it. Normally, the resolution is too poor to see an object that size. For another analogy, look at the beach in this satellite photo. Point out anything that you 100% certain is a human being. I can see the beach umbrellas and spots that might be anything. The satellite cannot zoom in sufficiently to see humans. And the silt is usually too coarse to show details of microscopic life.
Regarding the next point, the number of cells in the "simplest" animals. When we look at sponges, which can be quite large, were are looking at millions of cells but they are nearly identical in shape. If you were to break up a sponge and separate it into individual cells, it will reform into a new sponge. It does not have blood or organs; it is simply a large group of single cells working together. See here for some details. It has many cells but they are not differentiated cells.

3 Single-celled creatures still exist and reproduce. Why aren't any of them evolving?  The article writer imagines that diseases are not evolving. S/he needs penicillin the next time s/he is sick. Elsewhere I compared canoes to aircraft carriers. Canoes are like single-celled creatures and carriers are more complex. Both exist. An aircraft carrier, whatever other cool things it can do, cannot travel through Algonquin Park. Canoes are still canoes but are also very different from their origins.

2 Many single-celled creatures have been observed for thousands of generations with no significant change. Many, but I note not all. What is a 'significant change'? Bacteria are now capable of digesting nylon. The Long-Term Experiment has run for around twenty or thirty years and the E coli bacteria there can now digest citrate, something that no other E coli bacteria can do.

And now the reason I  have done this in reverse order: 1 There are no “simple life-forms.” If it is alive—it is extremely complex.
I think analogies fail at this level. We don't know how life began. There is no reason to expect evidence of the first life forms - see the first several paragraphs of this post. Anything alive today that we see and study or experience must be able to live in modern conditions.

One possibility for the first cell was that it formed in a microscopic gap in porous rock near a volcanic vent. It would not have needed much as it was both constrained by the space it lived in and was supplied with diffusing nutrients by the rock around it. There is no evidence to support or disprove this idea so it cannot be a theory, only a hypothesis. The point is, we don't expect evidence and there are workarounds for most objections.

Why do evolution proponents continue to claim there was a Universal Common Ancestor? Because of shared similarities across all domains of life that are best explained by one.

Thursday, 30 July 2015

Evidence is a funny thing.

Here are a series of Tweets that have had extra details removed.  Most of the excised details are of the original poster's ID and the IDs she was responding to.
Tami ‏@Tam...yama  Jul 27
Genetic entropy &  information & code in DNA refute biological evolution.
-
No mechanism exists that adds novel function info to DNA that allows, say, fish to evolve to amphibians or ...
-
.. reptiles to birds ... or invertebrates to veryebrates. So my rejection of evolution is EVIDENCE-based.
-----
Here is my attempt at a full-length response regarding evidence.  I believe the results of the Lenski experiment show how a duplication mutation followed by local mutations can add novel functions to DNA.

Evidence is a funny thing.

I want to start this discussion with some examples of events where we don't expect evidence of their occurrence.  I will start with New Testament examples so even before that, let me start with a reminder that where evolution is concerned, neither I personally nor the theory of Evolution is anti-Christian or anti-religion.  The Roman Catholic Church has long accepted evolution with a wonderful sentence on the subject from Pope John Paul II.
 "The convergence, neither sought nor provoked, of results of studies undertaken independently from each other constitutes in itself a significant argument in favor of this theory."

In addition, around 13,000 (13,008 signatures, as noted on my Birthday - probably not related) clergy in the USA have signed a letter stating that they see no conflict between their religious beliefs and the theory of Evolution.

OK, miracles in the New Testament where we do not expect evidence.  First, the miracle of the Loaves and Fishes.

Jesus Feeds the Five Thousand13 When Jesus heard what had happened, he withdrew by boat privately to a solitary place. Hearing of this, the crowds followed him on foot from the towns. 14 When Jesus landed and saw a large crowd, he had compassion on them and healed their sick.
15 As evening approached, the disciples came to him and said, “This is a remote place, and it’s already getting late. Send the crowds away, so they can go to the villages and buy themselves some food.”
16 Jesus replied, “They do not need to go away. You give them something to eat.”
17 “We have here only five loaves of bread and two fish,” they answered.
18 “Bring them here to me,” he said.
19 And he directed the people to sit down on the grass. Taking the five loaves and the two fish and looking up to heaven, he gave thanks and broke the loaves. Then he gave them to the disciples, and the disciples gave them to the people.
20 They all ate and were satisfied, and the disciples picked up twelve basketfuls of broken pieces that were left over.
21 The number of those who ate was about five thousand men, besides women and children.
---
It would be crazy for anyone, believer or not, to go to Bethesda, apparently on the Jordan River,  and look for evidence of the miracle but let's imagine someone tried.  They might find fish bones - but this is on the side of a river, so bones would hardly be surprising.  Maybe, if we wanted to stretch a point to a ridiculous extent, we could imagine looking for the bones of a thousand or so fish, all in the same location and all with enough good DNA in them to show they were somehow clones of each other.  That might show they were perfectly replicated in the miracle.
This excludes the possibility, though, of God choosing to make the fish pleasing each individual taste so all had their favorite, whether it be bass, trout, carp or well, fish that actually live in the Middle East rather than my native Canada.
So, we have a situation where finding the (far-fetched) evidence would defend the claims of the miracle but not finding the evidence does no injury to those claims.
The same might be said regarding evidence of Mary's virginity during her pregnancy.  'nough said.
----
ADDED LATER:
Snopes on The Lost Day (This is about the claim that NASA engineers working to organize their satellites for long periods of time, had made a computer program to plan for a hundred or a thousand years.  But the computer broke down and the reason was, there was a missing day.  This is crazy as Snopes explains)
Regardless of the amount of time involved, the discovery of a "missing" period of time remains implausible. If the sun had indeed stood still for a day a few millennia ago, we would have no way of determining that fact through astronomic observations today. We have no frame of reference, no cosmic calendar or master clock to check against to see if we're overdrawn at the Bank of Time. The concept described here would be like giving someone a non-functioning clock and asking him to determine how much time had elapsed since the clock had stopped running. One could note the positions of the hands on the dial and make a reasonable guess about what the time of day was when the clock stopped running, but without knowing whether that time was A.M. or P.M., and without knowing the calendar date on which stoppage occurred, one could not possibly make any reasonable estimate about how long ago the clock stopped
Read more at http://www.snopes.com/religion/lostday.asp#I5UKJbwmB6WfiB9k.99
AIG agrees as does ChristianAnswers.
-------------------------------------------
The point is, a lack of evidence for an event is not evidence of a lack of that event.

So now we turn to transitional fossils and their apparent lack.
As before, although I just said we would look at evidence, let's first look at what 'transitional fossils' are or should be if they exist.  A transitional fossil is an example of a once-living creature that has features of two different groups.  I will use 'Archaeopteryx' as an example to demonstrate what a transitional fossil is and isn't.
archaeopteryx appears to have characteristics of both dinosaurs and birds.  There are some features that are too technical for me to comment on but a toothy beak (dino), long, bony tail (dino) and feathers (bird) are good starting points.
Was Archaeopteryx the actual transitional species?  There is no way to be sure but it seems likely not.  The stony remains that hold the shape of the original bones do not have DNA and I wonder if full DNA would even help - we would need good exemplars of several dinosaur species DNA to compare it with.  The stony remains can only tell us that an animal existed that had the features expected of a transitional species.  Is Archaeopteryx the grandfather or the great-uncle of modern birds? Impossible to say.
For one thing, it appears that Archaeopteryx is too young.  There are more fully bird fossils deeper and older than Archaeopteryx.  Does this mean Archeop (please forgive the short-form, I am becoming tired of the full name.  Expect more of the like to come.) didn't exist before birds.  No.  a transitional fossil is like a single photograph.  I have a photo of me paddling a canoe in Georgian Bay dated to 1999 but I existed for 32 years before that and at least 16 -as of this writing - more after that.  A transitional fossil doesn't lock in the full period of a species' existence.  And we wouldn't expect it to.  The more common a species is, among other factors, means a greater likelihood of fossilization.  When a species first evolves and as it goes extinct, the numbers are going to be smaller.

Now for the 'other factors' mentioned in the paragraph above.  Fossils are rare.  This is not a desperate hope stated by paleontologists to explain away the claimed lack of evidence but a fact.  Let me defend this fact.
First, soft bodied and small animals are less likely to be fossilized.  bones, especially large ones, are more likely to last long enough to be buried in sediment and be fossilized.  A soft bodied animal or soft tissue of a bony animal is more likely to be eaten or rot away.  Such fossils are found but in lesser numbers.  This is a (n entirely reasonable) fact.

Second, many animals die where fossilization is unlikely.  Yes, I did choose the 'weasel-word' "many".  I can't say whether this is a majority or not, but i believe it is.  It is at least a large number, however else you define it.  Fossilization in a jungle is rare - the warm, humid condition encourage the life of ants and other scavengers even smaller.  a remarkable fact I recently learned is that the first Chimpanzee fossil ever found we found only eight years ago (in 2006).  To my knowledge, there are only around six chimpanzee individuals that have fossilized that we know of.  Another example is that of buried soldiers from World War 2.  Many died and were buried in France and after decades past some Americans have wanted their heroes to come home.  The graves were dug up but often no bodies -and seldom even cloth or belt buckles - are found.  Forty years after a large bodied vertebrate, buried below the active biological layer of soil and the remains are gone.

In the TV show for the book, Your Inner Fish, Dr Niel shubin describes fossil collecting in the American North-East coast.  At one place with huge tides, he described going onto the sea bed at low tide, finding many new fossils, trying to collect a few before being forced away by the returning tide. The next day, many of the fossils seen the day before are worn away and new ones are visible.  The life of fossils on the rock surface in this region can be measured in days or hours.

I haven't actually defended evidence of evolutionary change in this blog post but I hope I have defended the state of evidence and shown that the fossil evidence, weak as it might be (I think it is actually pretty good although that might be the subject to a later post), is satisfactory and not a deal-breaker for evolution.

Tuesday, 21 July 2015

more feathered dinosaurs

Sci Am has the details.  Below is an image from the link - deliberately shrunk a little - if you want full quality, follow the link.