Crater Science Reaches New Depths at Chicxulub, Ground Zero for the End of the Dinosaurs

If there was ever any doubt whether an asteroid impact killed off the dinosaurs, field scientists continue to bring back proof from ongoing research in the Gulf of Mexico.
Last week, geologists working in the Yucatán Peninsula reached a major milestone in an offshore drilling project of the Chicxulub Crater, now known to be the remnant of a 66-million-year-old collision of a gargantuan asteroid into the Earth’s surface. Reaching a depth of 670 meters (2,198 feet) in the crater’s peak ring for the first time, the scientists brought up core samples of the original granite bedrock that occurred as a result of this Earth-shattering impact.

Discovered in 1978 by geophysicists Antonio Camargo and Glen Penfield, the crater has been the subject of study and controversy for some time, but this is the first time scientists have dug this deep offshore, into the inner ring of the double-ringed crater. From the core samples, taken from below 66 million years of sediment piled onto the original molten rock formed at the time of the impact, paleontologists now have a completely new data set to study the earliest moments of Earth after the Cretaceous.

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Wikipedia

With this evidence, we can now put to rest a point of contention regarding the exact border between the Cretaceous and the next age in the life of the Earth, the Paleogene, known as the K-Pg boundary. Prior to this project, paleontologists defined the K-Pg boundary with the appearance of foraminifera, fossils of small shelled creatures. In a sense, the drilling project took science back in time through rock layers never before investigated and passed the K-Pg boundary at ground zero. Because this layer of ancient rock is so thick and and so unique, the drilling team is considering re-naming it the “event layer.”

This news highlights a great number of phenomena in both natural history and astrophyics. Astronomers have studied peak rings in craters on the moon, Mars and Mercury, but never before on our own planet. The Chicxulub now offers a local opportunity to study this type of supermassive impact.

Apparently, peak rings form in a matter of minutes when an asteroid is so big, its impact liquefies rock, causing the center of the crater, while it’s in motion, to splash upward in a cone shape like a drop of water into a filled sink. This molten rock creates a distinct layer of minerals that only form from asteroid collisions. As the team continues to bore deeper, now working more slowly to study this unique type of rock, they will search for rock layers “out of order,” testing a proposed model for this type of impact. Theories state when these impacts occur, older rock layers are tossed above younger rock layers.

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Wikipedia

The discovery of Chicxulub is a fascinating story in itself, and shows how difficult this thing was to find. Essentially, the crater is so old, the only evidence of it is a trough that forms a faint semi-circle on the western portion of the Yucatán Peninsula and a system of thousands of cenotes, sinkholes formed as a result of the impact. (We’re still unable to explain why.)

Prospecting for oil drilling sites for the Mexican oil company Petróleos Mexicanos (Pemex), Penfield noticed a huge underwater arc 40 miles across in his geophysical data. He found another arc on land years later. Penmex suppressed specific data to the public, but allowed Penfield and Camargo to present the findings at the Society of Exploration Geophysicists conference in 1981, which was poorly attended.

In 1980, unaware of Penfield’s discovery, Alan R. Hildebrand, a graduate student at the University of Arizona, published the first paper proposing the Earth-impact theory and was searching for a probable crater. He and his team found evidence of an impact in shocked quartz, a type of deformed quartz created by intense pressure and limited temperature (the conditions of an impact crater), and tektites, beads of glass shaped like drops of water that form when molten rock is ejected into the atmosphere. Both of these materials occur in large deposits in the Caribbean basin.

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Wikipedia

Carlos Byars, reporting for the Houston Chronicle in 1990, connected the dots between Hildebrand’s theory and Penfield’s discovery, and Hildebrand and Penfield obtained Penmex drill samples stored in New Orleans for Hildebrand’s team to study. The samples matched Hildebrand’s theories.

Further research into the crater in the late 1990s using gravitational anomaly imaging showed the crater is a system of two concentric circles, the outer circle measuring 190 miles in diameter, nearly five times the diameter of the inner circle.

Personally, as a Texan, a Houstonian and a dinosaur nerd, I take pride in these developments. 1. The Chicxulub crater was discovered by a Mexican oil company. 2. A Houston reporter identified the crater as the one that killed the dinosaurs. Two points for Texas, a state steeped in petroleum science and Mexican culture.

For a grandiose, and slightly terrifying, example of how an asteroid impact can change the face of the Earth (the Chicxulub crater was created by a much smaller asteroid), watch this Discovery Channel simulation set to Pink Floyd’s “Us and Them.”

This Dino Toy’s All Wrong! What’s Up With That!?

by “Jurassic” James Washington III

With the exception of our feathered friends, dinosaurs are all but gone today. So what are the ways to connect to these long lost creatures? Well as a child I had three options — museums, media and models. Going to the Houston Museum of Natural Science and standing in the shadows of the fossilized skeletons gave me a sense of their size and majesty. Dinosaurs in the media consisted of news stories, articles, documentaries and books. But the models (or toys) were the third part my mind needed to fully imagine these masters of the Mesozoic. For some reason holding a model of the animal in my hand gave my mind the final ingredient to fully imagine dinosaurs as they might have looked.

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As an adult I have the honor of working at the museum as a Discovery Tour Guide specializing in the Morian Hall of Paleontology. I literally get to go to the museum five out of seven days a week! I have traded in my documentaries for scientific text books and published journals. And although I stopped playing with the toys, I still collect them, using them as models in contrast to the actual fossils upstairs. Which brings me to the point of this article. In the age of the Internet and easily accessible museums and colleges, how is it that certain tour companies can make inaccurate models? It may seem minor to an outside observer, but the number of fingers and toes or the lack of a crest are some important ways to make a species identifiable.

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For the record I am not commenting on fictional dinosaur-like creatures such as Godzilla or the Indominus Rex from the movie Jurassic World (2015). Or the changes made through time, such as the orientation of the necks and tails of Sauropods (long necked dinosaurs) like Diplodocus. Or how Velociraptor toys have no feathers in the early 1990’s. Those toys were made with the accepted science of the time, though now we know they were wrong. I am also not considering how some dinosaur toys are made cute for preschool-age children. My remarks are on toy companies that claim to make scientifically accurate toys/models in the 2000’s without certain diagnostic features.

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Diplodocus through time. Manufacturer and year produced from left to right: Collect A 2013, K&M 2004, TS 2001, British Museum (Natural History) 1974, Safari Ltd 2006, Safari and later Carnegie 1988.

As displayed by the image above, Diplodocus has seen a variety of modifications in the toy and model world. Yet each model maintains its long, whip-like tail, narrow horse-like face, hind legs longer than forelimbs and general slender form when compared with other Sauropods. No matter the incarnation, you know it is Diplodocus.

Another easy example is the genre Stegosaurus, which has three toes on its hind limbs. This feature (narrow pillar-like feet) indicates Stegosaurus lived in a dryer or at least more solid surface and not in swamps. So when I see a Stegosaur toy or model with the five standard toes of lizards, I can’t help but wonder why they didn’t take the time to consult someone, anyone, in the field of paleontology before they began production. It’s like making a modern rhinoceros toy with rodent feet or giving a giraffe zebra stripes. Just google “Stegosaurus skeleton” and the number of toes is consistent on pretty much all the images.

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The many faces of Stegosaurus. Manufacturer and year from left to right: Toy Major Trading CO. LTD. 2008, Jasman 2001,Dur Mei 1986, Jurassic Park’s Kenner 1993, The Lost World’s Kenner 1997, Safari LTD, Dino Riders 1989, Papo 2005, Dinosaur Valley 2005, Safari 2007 and K&M 2004.

Of the eleven Stegosaur models/toys in the above only four have the correct number of toes! Dino Rider 1989 (surprisingly), Papo 2005, Safari 2007 and K&M 2004. The two on the far left of the picture have five and the rest have four. What I find most surprising is the fact that Safari put out two different figures with different numbers of toes?

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Mosasaurs show me those pearly whites! Manufacturer and year from left to right: Safari 2010, Carnegie 2008, Papo 2012, Collect A 2009 and Mojo 2010.

Mosasaurs are the marine reptiles of the upper Cretaceous period that were made even more famous by Jurassic World. Although the movie made the animal too large, they did get one thing right. Mosasaurs, like pythons, possess a second row of teeth inside their jaws. Only one of five Mosasaur models have that iconic feature. The 2008 Carnegie model seen second to the left is the only one with the correct dentition. When I show this feature to museum guests on tours, they are shocked and amazed! I can see why now — 80 percent of Mosasaur toys in the mainstream market lack that feature. But know that the Jurassic World Mosasaur has the teeth, which can be seen when it eats the poor British woman who did nothing wrong. Unfortunately the Jurassic World Mosasaur toy (which I do not have yet) neglected to be consistent with their own movie. No second row of teeth!

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Ceratosaurus family reunion.

Ceratosaurus lived in North America during the upper Jurassic. The name Ceratosaurus translates to “horned lizard” because it has a nose horn and two crests over its eyes. Ceratosaurus also has four fingers on its forelimbs. The tall yellow one in the back is from Remco Galaxy fighters from the 1980’s. It has the nose horn but only one crest between its eyes. But it does have all four fingers! The tall green one to the left has the nose horn, but is missing the eye crests altogether and only has three fingers. One step forward, two steps back. It also lacks its manufacturer’s logo, as if they didn’t want to take credit for their work…

The figure with a purple hide and pink nose horn is labeled Oviraptor. Which is almost a felony if you knew anything about Ceratosaurus or Oviraptor! The toy is manufactured by Boley, who is known for putting out mislabeled figures in the world of fast and furious dinosaur toy collecting. But it does have the nose horn and four fingers. If it had two eye crests it would be a good example (in toy form) of Ceratosaurus. Too bad it’s labeled Oviraptor. In front on the right is the Jurassic World Ceratosaurus. It has a nose horn, two crest-like projections over the eyes and four fingers. I know it’s not said very often, but good job Jurassic Park franchise on your scientific accuracy. The medium figure in the middle with a red hide and yellow underbelly is from 1998 (hard to read the stomach). The horn and crests are good enough, but it only has four fingers. Missed it by that much.

I saved the best for last. The three small figures on the lower left are, from left to right, Safari 1996, Safari 2012 and Terra 2015. All three figures have the correct horns, crests and finger counts! In short, buy the smaller more detailed models.

Dino7But there is a silver lining. As you might have noticed there is an attempt to correct these mistakes over time. And the Boley figure to the left tells it all. When this very same figure was produced in the early 2000’s it was labeled Metriacanthosaurus. Metriacanthosaurus was like a Ceratosaurs without horns and a small sail running down its back and tail. Later the name was changed to Edaphosurus. This was close but still wrong, but they at least classified it outside the dinosaur clade. The animal the toy represents is a relative of Edaphosaurus. Unfortunately, an Edaphosaurus has a smaller skull and a sail of a different shape, and the spines have small projections. But one day, one glorious day, I saw this figure label Dimetrodon. A victory, no matter how small. After two failed attempts, Boley finally got it right. The third time was actually a charm!

Now I know you may think of me as a grown man obsessed with dinosaur toys, and you are probably right. But my fiancé thinks it’s cute. She considers it better than collecting motorcycles or gambling. All I’m saying is many people go to college to earn degrees and/or commit countless hours to understanding the exact morphology of these long-extinct animals. And for a toy company to barely attempt to fact check an educational model that they sell to children? It’s just unacceptable. Imagine a store selling toy tigers with stripes and lion-like manes, whales with gill slits and blow holes or sea lions with long floppy rabbit ears. And that weirdness is what plagues comments. Thank you.

Editor’s Note: Watch for a special exhibit opening in the Morian Hall of Paleontology Feb. 19! Amber Secrets: Feathers from the Age of Dinosaurs offers a glimpse back in time to the forests of Burma in middle Cretaceous, when plants were just beginning to develop flowers. See extinct insects trapped inside fossilized tree resin, and an astounding surprise: feathers in the time of T. rex and Triceratops!

James is a Discovery Guide at the Houston Museum of Natural Science.

The guts stop here: Delve deeper into dinosaurian intestines with Dr. Bakker

Attention all Dino-Nerds! Put Your Anatomical Expertise to Work. Prestigious Careers Await in the Field of Gastroenterology.*”

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Where the guts fit in a T. rex. The pubic bone (yellow) sticks down and won’t let the intestines expand behind the hip socket.

Often, I get approached by parents who fret over their dino-fixated kid. “You gotta help us, Doc. All she wants to do is read about fossils. Will she ever find a respectable career in the real world?”

I can reassure Mom and Dad that studying dino anatomy can lead to well-paid and honorable occupations — for instance, as a professor of anatomy or a foot surgeon or a knee specialist. Or a gastroenterologist. Being a gut doctor is becoming especially attractive now because aging yuppies are suffering from decades of intestinal abuse from spicy nachos and a misplaced reliance on gluten-free pizza.

So, adults, encourage the children to delve deeply into the dinosaurian intestines. It’s fun. It’s educational. It might pay off — big time.

T. rex was a gut-less wonder

The first step toward a visceral understanding of dinos is to face the fact that T. rex was a gut-less wonder. Consider the rexian body cavity. The space available for guts is severely limited. That’s because the intestines must stop at the pubic bone, the big prong that points straight down from the hip socket. It’s inviolable anatomical law: No intestines can be behind the pubis!

In a rex, that means all the guts are in front of the hip socket and there just isn’t a lot of room here. You might argue that rexes were forced to be pure carnivores because they needed high protein food that could be digested with a minimum weight of gastric equipment.

(Vegan advice: A gentle admonition to all my vegan friends in Boulder, Colorado: High fiber plant food demands big, complicated gut compartments, a series of vats where the fodder is soaked and softened, worked upon by microbes that secrete the enzymes needed to break down fiber. That explains why Herefords and zebras, which are consummate digesters of grass, have naturally rotund tummies. Contrary to widespread myths, we humans, when we first evolved, were not adapted to high fiber, animal-free diets. When Australopithecus evolved into our genus Homo, the size of the gut shrank dramatically. So we had to specialize in protein-rich food, such as eggs, baby birds, grubs, turtles, bunnies and antelope carcasses scavenged from unwary saber-tooth tigers — plus, of course, nutritious fruits and nuts and tasty tubers excavated with digging sticks and roasted over the fire. Fire was domesticated at about the time our guts diminished in volume. Cooking releases food value otherwise unobtainable with our small-size intestines. Today, a modern human can indeed survive on a plant-based diet but you choose your veggies carefully. And cook ‘em.)

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Fowl guts.

Chickens that don’t fall over

Now that we’ve learned the basic laws of gut size, we are ready to unlock the mystery of the balanced chicken. You’ll remember from the previous post that barnyard fowl have exquisite balance on just two legs, despite the lack of a heavy tail.

Here’s another fowl mystery: Chickens have formidable digestion. They can extract food value out of raw grains and plant fiber far better than we humans can. The secrets to balance and digestion are one in the same — the gut-wrenching development of the pubic bone. When an embryonic bird in its egg is just beginning to develop a pelvic skeleton, the pubis points down, sorta like an adult T. rex pubis does. But when the chick hatches, the pubis has rotated completely around so it points backward and the guts expand behind the thigh.

Brilliant! The pubic re-alignment has doubled the potential room for intestines. And all that new weight of intestines is behind the hips, and therefore, confers perfect balance without any sort of ponderous tail.

Pubic-wrenching is a splendid osteological trick. Some dinosaurs did exactly the same thing. Stroll past our fine duckbill skeletons. Fix your gaze on the pubic bone. It’s rotated backward, just like a four-ton version of the barnyard fowl.

The duckbills go even further in gut expansion than do most birds. The pubis and ischium (the other lower hip bones) are so extended toward the rear that the guts gain another yard or two of length and allow another couple of chambers for microbial action on the food. All those extra digestive vats would let the duckbill G.I. tract break down even the toughest, most fibrous vegetables.

Duckbills win the award for longest gut tract of any dinosaur. And, probably, had the least constipation problems.

There’s a word every dino-nerd learns in the first grade: “ornithischians”. The simple meaning is “dinos with bird-style hips,” and that denotes the many species, like duckbills, that have undergone gut-wrenching. Stegosaurs wrenched their pubes, as did Triceratops.

Make a game of it! Go through our Fossil Hall with the children seeing how many different skeletons show the backwardly-bent pubes. Make the whole family pubo-literate!

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Before and after gut-wrenching experience: Top duckbill dinosaur shows how intestines would be limited if the animal had the primitive, vertical pubis. Bottom duckbill shows the real bent-back pubis and ischium.

When I skulk around our tour guides as they talk to school groups, my rib cage swells with pride. Our docents are the best! So I want to add an advanced bit of pubic-lore here. Stegosaurs and many other gut-wrenched herbivores do something tricky, pubis-wise.

After they evolved the backward-pointing pubis, these dinosaurs grew new pubic prongs — one on each side of the rib cage — that pointed forward and outward. This new set of prongs didn’t change the gut layout at all. The new prong lies outside the body cavity. The guts lay between the left and right new prongs.

What good did the new prong do? A stout muscle probably attached to it and ran back to the thigh to help swing the hind leg forward. If your child is considering med school, tell her that this muscle is what we call in humans the “psoas.

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Colorado State dino, Stegosaurus, showing the new prong of the pubis that points forward. Don’t confuse it with the true pubis!

And now, the ultimate Darwinian inquiry into gut-wrenching, the question that earns me sour stares from all my creationist relatives (37 full cousins on one side, 97% creationists)…

Here’s the query: When did pubic-twisting happen in the evolution of birds?

The chicken diagram I used earlier works pretty good for all modern day birds — every single one of the 10,000 species. From hummingbirds to ostriches, today’s avian species have the strongly wrenched pubic shaft and the attendant elongation of all things intestinal. No modern bird has the vertical pubis and short gut of a T. rex.

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Diagram of Archaeopteryx from Heilmann’s 1926 book “Origin of Birds”, modified by me in 1958. Heilmann explained the mix of bird and pre-bird features.

Archaeopteryx surprises

When first discovered in the 1860s, the Late Jurassic Archaeopteryx was an evolutionary celebrity, a missing link combining perfectly formed avian designs with archaic dinosaurian features. The first “Archie” skeleton excavated was jumbled but it certainly looked like the long, thin pubic bone was bent back in standard bird configuration. “Archie” also possessed another definitive bird device — the lagoonal, limestone-preserved imprints of fully-formed flight feathers.

Some dino characteristics were retained too: sharp little teeth, curved claws on the fingers, separate bones in the wrist (modern birds fuse up the individual bony units), and a long bony tail. The Archie was dubbed “Ur-Vogel” in German, an event which solidified the critter’s place in nature.

“Proof that creationism is wrong and Darwin is right!” shouted many an agnostic in 1868. In fact, the chap who coined the term “agnostic,” Thomas Henry Huxley, led the charge in proclaiming birds as descendants of wee dinos. Huxley’s favorite dinosaurian was Compsognathus, the original “Chicken-Dino,” a Late Jurassic carnivore extracted from the very same lagoonal rock that produced Archaeopteryx.

The Compy skeleton was cute as a button — so small that Huxley could imagine it perched on his shoulder during debates about Darwinism. When I began reading dinosaur books in the 1950s, the Compy was still the tweensiest dino known and several kids’ stories had a pet Compy following a second grader to school.

That image was just too cutesy-pootsy, too Disney, and the Compsognathus needed a makeover to give the species gravitas. The Jurassic Park franchise of the 1980s did just that. In the first Jurassic Park book, Compys are turd-eating pack-hunters that would jump up into a crib in a children’s hospital to bite off the kid’s nose and cheeks and rest of the face. That scene definitely stripped away the excess cutesy.

In the movie Jurassic Park, the Compys were upgraded to frilled little monsters that spat narcotizing pea-soup in the face of characters before biting off their noses, cheeks and rest of their faces. That scene ripped away the excess pootsy.

Movie villains can seem especially evil when they begin as pint-sized plush toys and then metamorphose into killers. Remember Gremlins and Chucky? (Maybe the writers of Jurassic Park scripts were trying to do to Compys what Miley Cyrus did for herself — take an adorable little star and remake the image so it seems more adult and more formidable. I believe that, when you go slow-motion through the Jurassic Park movie, you can see some of the Compys twerking.)

(Be advised: Jurassic Park books and film mix and match parts from three different dinos: (1) The true Compsognathus, beloved of agnostics; (2) The enigmatic pro-compsognathids known only from incomplete Triassic specimens; and (3) The distant compy cousin, the hefty 20-footer, Dilophosaurus, from the Early Jurassic. None were poisonous. None could spit. But recent discoveries from China reveal a raptor with teeth grooved like a gila monster’s — that means poison glands dripped venom down the grooves into wounds. Cool.)

Bakker Dino Guts 6In all three real dinos that inspired the Jurassic Park Compys, the pubis pointed downward and forward, the primitive configuration for carnivorous dinos and retained in our Texas Coelophysis. No gut expansion here.

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Bambiraptor, a little raptor-type dinosaur from the Late Cretaceous. Diagram done for Dr. David Burnham and me when Bambiraptor was named. Note that the pubis is bent back just a bit.

In the 1970s, Yale’s John Ostrom rediscovered Huxley’s insights. He used the recently discovered Deinonychus and its kin to prove that raptor-type dinos had hands, feet and a tail nearly identical to what Archaeopteryx possessed. But raptors still had primitive pubic bones that were bent back just a little bit. See the raptor-pubes for yourself in our “Julie-raptor” skeleton on display at HMNS or in the Bambiraptor skeleton in the lab (come by and take a look).

So, because of its superior pubic wrenching, Archaeopteryx was entitled to be hailed as more advanced than most raptors.

That made us all happy because we could make a nifty evolutionary scenario — an early raptor-like dino, a Jurassic version of Deinonychus, evolved into an Archaeopteryx-oid and then the Archie-oid evolved into a modern bird in the Early Cretaceous. Take that, my creationist-cousins!

(By the way, don’t let TV’s South Park mislead you; the plural of “pubis” is “pubes,” and it’s pronounced “pew-bays” and not “pewbs.”)

But then came the inevitable Oops Moment. That happens whenever we get too cocky.

Our friends at the Thermopolis Dinosaur Center in central Wyoming announced they had obtained a near perfect Archaeopteryx in 2006. I rushed up to ogle it, armed with a zillion photos of all the other Archie specimens. I stared at the pubes.

The new specimen and the other best specimens showed that the simple pelvic scenario was wrong. The real, undistorted Archaeopteryx pubis pointed straight down. No backward wrenching at all. In other words, Archies had no gut expansion whatever. The Ur-Vogel was no more advanced in this one key hip feature than an allosaur or a tyrannosaur.

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A very accurate diagram of Archaeopteryx, drawn by the magisterial paleontologist Peter Wellnhofer, who is the all-time expert on Jurassic pterosaurs and birds. Note the disturbingly vertical pubis.

Dang, dang, double dang

In this one famous feature, the backward wrenching of the pubis, Archaeopteryx turns out to be less like a modern bird than Bambiraptor or Deinonychus. Gosh … nearly every ornithischian dinosaur has more advanced pubic positions than does an Archaeopteryx.

We should’ve known. Evolution hardly ever goes in a neat, straight line. The origin of birds didn’t come about as one undivided line of dinos that gets better and better, more and more like a chicken, from the Triassic through the Jurassic and then into the Cretaceous. Darwinian family trees are much more complicated and much more confusing — more like tangled blackberry bushes, full of short branches going off in all directions. There are side branches and side branches coming off the side branches.

Archaeopteryx itself couldn’t survive by being a mere ancestor; it had to fit into its local environment; it had to be adapted to its immediate surroundings. The short gut and un-wrenched pelvis worked fine. A cluster of raptor-like dinos, with minor variations in pubic slant, shared the basic Archaeopteryx blueprint — and they too thrived for millions of generations. Even in the latest part of the Cretaceous, un-wrenched guts with vertical pubes contributed to the success of little Bambiraptor type predators.

Finally, after the Cretaceous ended, all the raptor-type dinos and all the birds with vertical pubes were extinct. Now, in today’s habitats all over the world, no bird or bird-like animal operates with the un-wrenched gut. Why? Did the short gut prove inadequate somehow in the long run? Could be. But we must remember that short-gutted birds and raptor-like dinos had done very well since the Mid Jurassic to Late Cretaceous, and that’s a full 100 million years. It’s not totally true, the old adage, “No guts, no glory.”

* It’s traditional for paleontologists to teach anatomy to pre-meds. I did that for years: at Harvard, then at Johns Hopkins. Thomas Henry Huxley, who worked out relations between little dinos and birds in the 1860s, also taught courses in basic dissection. It’s even more socially acceptable to be a genuine medical doctor who also digs fossils.

True story, not a Seinfeld episode: When I visit my mom at the retirement home, she introduces me as “my son, Dr. Bakker.” All the octogenarian ladies lean forward smiling. Then, politely, they begin to ask specific questions about certain medical conditions. Mom whispers, “He’s not a real doctor…” and all the ladies lean back with a slight curl of disapproval in their smiles.

Nota bene: The new book Ten Thousand Birds, (Princeton University Press), is wicked good — best ever done on our feathered species. Beautifully written. Everyone should get a copy.

Cracking the coelacanth code: Living version of HMNS fossil has genome sequenced

The coelacanth — a “living fossil” believed to have hardly changed over the last 300 million years — has finally had its genome sequenced by European researchers.

courtesy of wiki media
The deep-sea fish was the inspiration for the famous 1954 film Creature from the Black Lagoon and is well-represented here at HMNS, where we have three examples on display: a Devonian fossil, a Cretaceous specimen and a model like the one sequenced.

Researchers sorted through nearly 3 billion DNA bases to conclude that the coelacanth’s four fleshy fins were likely the early predecessors of limbs.

Although the coealcanth is related to early tetrapods — the first creatures to make the transition from the ocean to land — a comparison of the coelacanth genome with the DNA profiles of lungfish and other modern land-based animals led scientists to conclude that lungfish were the closer relative.

Coelacanths have been notoriously difficult to study, having been assumed extinct until an African fisherman caught the living fossil in 1938. Since then, only a few hundred specimens have been found.

Continue the investigation yourself at our Morian Hall of Paleontology, and see why this mysterious fish has kept researchers rapt for so long.