Scientists learn more about the “Tully monster”
Scientists learn more about the “Tully monster” This photo provided by The Field Museum in Chicago shows a fossil of a Tully monster. (Paul Mayer/Sean McMahon/The Field Museum via AP)
Scientists learn more about the “Tully monster”
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For decades, fossil hunters combing the soil near a creek in north-central Illinois have been rewarded with the preserved remnants of a prehistoric creature, its wide-set eyes on stalks and a long, arm-like appendage extending from below them with a pincer-like mouth.
 
There was no doubt that the Tully monster, Illinois' official state fossil, was "very, very bizarre," said Scott Lidgard, a paleontologist at Chicago's Field Museum. But no one could say exactly what the soft-bodied creature was.
 
That changed March 16 with a paper published in the journal Nature. A group of researchers, Lidgard included, concluded the Tully monster had a precursor to a backbone. It was a vertebrate, or primitive fish.
 
The origin of vertebrates is still an open question, he said. There aren't many good examples of preserved, soft-bodied fishes. It's also personally important for Lidgard, who's long been charged with the museum's collection of 1,800 Tully monster fossils, the largest in the world.
 
"I'm pretty excited because I've had to live with this guy, something I wish I knew what it was, for my 32 years here," he said. "And it's been a puzzle."
 
The fossilized remnants of the Tully monster have not been found outside Illinois, only in the Mazon Creek area. It's about 50 miles southwest of downtown Chicago. About 300 million years ago, the spot was a warm coastal marsh along a long-gone sea near the equator. This was before the dinosaurs. Tyrannosaurus rex didn't come about until roughly 67 million years ago.
 
The abundant plant life eventually became coal, and eons later, strip mining dug up piles of earth and shale - and fossilized prehistoric life. Paleontologists consider the area a treasure because of plant and animal life that was, for reasons not fully known, set in stone quickly enough before decay could set in.
 
An amateur paleontologist named Francis Tully unearthed the first Tully monster in 1958 and thousands of other examples have since been found by fossil hunters combing the area. Much of the area is now set aside as Mazonia-Braidwood State Fish and Wildlife Area.
 
Mining faded in the 1970s, and, after decades of fossil hunting, the area does not yield quite as many specimens as it used to, said Colleen Schmidt, an office associate at the state fish and wildlife area.
 
But those who know where to look - "they do have their (secret) spots," Schmidt said - can still find plenty. They leave with oblong nodules of rock, some of which, when broken open, contain fossils. Often it's plant life, like prehistoric ferns that are hard to imagine on Illinois' prairie.
 
The Tully monster fossils show a creature that swam the shallows of that ancient sea and ranged from a few inches long to roughly a foot. There are traces of other, more-familiar animals, Lidgard said, especially the odd mouth and its teeth, known as stylets, that share some characteristics with squids and lampreys. The eye stalks are similar to some snails.
 
But the team of researchers from the museum, Argonne National Laboratory, Yale University and elsewhere focused on some of the fossils' curious raised areas. Those areas were once believed to be remnants of the animal's guts, but that kind of soft tissue would have been pressed flat as it was fossilized, so these areas must have been something harder, more resilient, they thought.
 
"It has a cartilage skeletal system," Lidgard said the group concluded. "It runs along the midline. Beneath it is the nerve cord ... Sort of a precursor to a spine."
 
Even with the discovery, the Tully monster remains in many ways an unanswered question.
 
That strange mouth, extended away from its body, may have helped it as a predator, Lidgard said.  Or maybe it scavenged for food. The wide-set eyes may have given it a greater field of vision for hunting, but no one knows for sure.
 
And Mazon Creek continues to offer more mysteries.
 
"There's an animal called the H animal," named for its odd, H-shaped body, Lingard said. "We don't know what it is."

Source URL: https://www.tweentribune.com/article/teen/scientists-learn-more-about-tully-monster/

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CRITICAL THINKING QUESTION
Why is the creature called a “monster?”
Write your answers in the comments section below


COMMENTS (31)
  • johnj-fel
    4/22/2016 - 02:20 p.m.

    The creature is called a "monster" because of its size and figure and because it is all together "strange."

  • elizabetht-fel
    4/22/2016 - 02:20 p.m.

    The Tully monster is referred to as a monster because of its slightly bizarre appearance. Such as its arm-like appendage or its eyes on stalks.

  • travond-fel
    4/22/2016 - 02:20 p.m.

    because anything that aint normal in our day is consider a monster and it looks pretty not normal

  • kolbyd-fel
    4/22/2016 - 02:22 p.m.

    It is called a monster because people dont realy know what it is.

  • travisb-fel
    4/22/2016 - 02:22 p.m.

    The creature is called a monster because it came along nearly 300 million years ago (nearly 250 million more years than dinosaurs) and scientists are unsure what they are or what happened to them.

  • victoriae-fel
    4/22/2016 - 02:23 p.m.

    The creature is called a "monster" because it was something they had never seem before and it was very weird looking.

  • lucasp-fel
    4/22/2016 - 02:23 p.m.

    The creature is called a monster because it is unknown.

  • jacih-fel
    4/22/2016 - 02:23 p.m.

    The creature is called a "monster" because scientists have yet to find everything out about it so it is still a mystery of exactly what it can do and how big it is.

  • callans-fel
    4/22/2016 - 02:24 p.m.

    The creature is called a monster because of the way it looks. The article quotes "fossil hunters combing the soil near a creek in north-central Illinois have been rewarded with the preserved remnants of a prehistoric creature, its wide-set eyes on stalks and a long, arm-like appendage extending from below them with a pincer-like mouth," so, it kind of fits the appearance of a monster. In my opinion at least.

  • austina-fel
    4/22/2016 - 02:24 p.m.

    This creature is called a "Monster" because it had a wide-set eyes on stalks and a long, arm-like appendage extending from below them with a pincer-like mouth.

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