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.”

The Adventures of Archie the Traveling T. Rex: Big Bend National Park

by Charlotte Brohi

Well, it’s Archie reporting in….

After my visit to Paris, I thought it high time I went to a place closer to home that has fossil records of some of my friends in the dinosaur world. Can you guess where?

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So, I hunkered down in my suitcase for the short flight to Midland, Texas, my jumping-off point for my adventure to the Big Bend National Park. Don’t worry. I brought sun protection (a hat) and extra water because I was planning to hike as well as learn a few things.

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You are probably asking, “but Archie, why Big Bend?” To be honest, I was totally inspired to go WILD and visit a national park ever since I saw the new Giant Screen/IMAX film at HMNS called National Park Adventure 3D. That’s me in my 3D glasses below. Spoiler alert: this film showcases 13 of the famous parks and it has better music than what is on my playlist!

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Feeling adventurous, and having learned that this year marks the 100th anniversary of the National Park system I just knew I HAD to go! How often do we get to celebrate a centennial? Do you know who is credited with this monumental feat? If you shouted to yourself, “President Teddy Roosevelt” then you would be correct! Sadly, he lost both his wife and mother on the same day but he credited his time in the wilderness as crucial to his emotional healing and thus inspired him to protect the wilderness. I LOVE being in the wild too, don’t you?

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Because I didn’t want to play favorites I also ventured to Big Bend State Park. You can’t tell from this photo, but Big Bend is considered moderate-altitude (between 5,000 and 6,000 feet). I still had to catch my breath and take it slow up the trail. Remember, altitude can negatively affect those who are older and can only use half of their appendages when walking… Like moí! See, I did learn something in Paris.

As I prepared for my hike, I took a look around and remembered that Big Bend has the youngest of all Texas dinosaurs, dating to the end of the Mesozoic, 66 million years ago! I am walking in the footsteps of greatness!

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The next day was pretty hot (100 degrees, to be precise) so I decided to stay cool in my traveling suitcase as I pondered the fact that more than 90 dinosaur species, nearly 100 plant species, and more than two dozen fish, frogs, salamanders, turtles, crocodiles, lizards, and even early mammals have been discovered here. But to most of us, it’s just so darn BEAUTIFUL!

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And because I’m a good steward of the environment, I didn’t pack anything extra to take home with me. It’s important to preserve all cultural and natural artifacts. So I only took photographs and left only footprints.

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Did you know that the Rio Grande River is the international boundary (1,000 miles) between Mexico and the United States, and the “big bend” follows more than 100 miles of that boundary? In fact, the park was named after the area, which has a large bend in the river. I love learning the origins of names. Just like my name, Tyrannosaurus Rex, which comes from Greek and Latin roots that mean “tyrant lizard king.” My friends just call me T. rex, though. Or Archie. It’s less intimidating.

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The Stars at Night are Big and Bright…

Once the sun went down, I gazed at more than 2,000 stars. Big Bend has the least light pollution of any other National Park in the lower 48 states. There’s even a song to celebrate its greatness. I also used this cool app called StarView to identify stars and planets in the night sky. Jupiter, one of the five bright planets, was indeed bright and beautiful!

I didn’t want to leave, so I promised myself I’d come back when it’s a little cooler. Shoot, I may even decide to head to the McDonald Observatory in Ft. Davis (which has nothing to do with burgers and fries). But until then, I’ll get my stargazing fix at the George Observatory in Brazos Bend State Park, another very cool place to see the stars and enjoy the natural beauty of the great state of Texas.

You can find Archie and the whole Adopt-a-Dino family in the HMNS Museum Store. Drop by and take one home!

Editor’s Note: Charlotte is the Vice President of Film Program and Distribution for the Houston Museum of Natural Science.

Exploring the Natural Sciences with Blocks: It Can Be Done!

Nothing inspires both children and adults quite the way a museum does. A close second is the inspiration that both the young and old find playing and experimenting with various kinds of toys that encourage building and construction.

Exploration of the natural sciences and imaginative construction play are a natural fit. The museum’s new exhibit Block Party provides a unique opportunity for families to first explore the natural sciences in the museum’s exhibit halls and then to experience hands-on creative exploration as they get up to their elbows in interlocking bricks that can be used to build anything imaginable!

It’s well-established that block or building play are ideal avenues to develop fine motor skills, hand-eye coordination, capacity for divergent thinking, collaborative skills, and spatial thinking in children. In addition, there’s evidence connecting complex block play and construction toys with advanced math skills in later life. Building play is also beneficial for the brains of tweens and adolescents, and don’t be fooled, they still love to build and play. Recent studies link construction play with superior performance on tests of spatial skills and mathematics for older children.

Structured block play is a term used when a child attempts to recreate a construction by consulting a model or blueprint. This kind of block play calls on a specific skill set that is crucial for many complex tasks. Why not take advantage of the various opportunities available at the museum to collect inspiration for structured block play?

In order for your child to build a recreation of something they observed in the museum, they have to analyze what they saw, perceive the parts that made up the whole, and figure out how the parts relate to one another. Here are some great ideas to get you started. Visit the exhibits and then visit Block Party to build and explore. Please share the great ideas you and your children come up with, and don’t forget to submit your creation to our weekly contest!

Cullen Hall of Gems and Minerals

Discover the beautiful gems and minerals and then recreate the geometric structure of minerals using interlocking blocks.

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John P. McGovern Hall of the Americas

Explore models of Maya and Aztec temples and pyramids and then construct your own.

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Morian Hall of Paleontology

Discover all manner of prehistoric fossils and then reconstruct models of biped and quadruped dinosaurs to experiment with balance.

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Welch Hall of Chemistry

Visit the periodic table of elements in the chemistry hall and then model different molecules.

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Cockrell Butterfly Center

Visit the butterflies and observe the amazing symmetry of their wings, then build a symmetrical model of your own using blocks.

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Burke Baker Planetarium

See Robot Explorers in the Planetarium and then create your own model robot to explore other worlds.

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Wortham Giant Screen Theatre

Watch Journey to Space 3D on the big screen and then design a space ship to send to Mars.

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Wiess Energy Hall

Journey through the energy hall and then construct an innovative model drilling platform or solar energy farm.

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Strake Hall of Malacology and Hamman Hall of Texas Coastal Ecology

Discover the amazing world of coastal ecology and mollusks. Then, design and build a model of an artificial reef to be used in conservation efforts.

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Farish Hall of Texas Wildlife and the Frensley/Graham Hall of African Wildlife

Observe the different dioramas and then construct your own museum display using building blocks.

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Have a great time building your relationship with your child by building with blocks! Our brand-new Block Party interactive play area is designed to inspire the imaginations of all ages. Construction has begun and the excitement is building!

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.