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| Tyrannosaurus Rex |
No dinosaur bones or fossils have ever been discovered in Illinois -- for the simple reason that this state's geologic sediments were being eroded away, rather than actively deposited, during most of the Mesozoic Era [1] (250,000,000 BC to 65,000 BC). No dinosaur bones or fossils have been found in Wisconsin, Michigan, Indiana or Ohio.
Still, Illinois can boast a significant number of amphibians and invertebrates dating to the Paleozoic Era [2] (541,000,000 BC to 251,900,000), as well as a handful of Pleistocene period (2,600,00 BC to 12,000 BC) pachyderms (Woolly Mammoths, Mastodons and other elephant type mammals). Illinois was geologically unproductive for much of the Mesozoic and Cenozoic Eras (250,000,000 BC to 2,000,000 BC), hence the lack of fossils dating from this vast expanse of time.
However, conditions improved tremendously during the Pleistocene period when herds of Woolly Mammoths and American Mastodons tramped across this state's endless plains (and left scattered fossil remains to be discovered, piecemeal, by 19th and 20th-century paleontologists).
Joe Devera has been an Illinois State Geological Survey geologist for over 30 years. "Other dinosaurs, such as T-Rex, could be found in Illinois, but they're covered up by vegetation and soil," he said. "People think of dinosaur bones out West because the ground is dry and eroded, and bones are much easier to find," Devera said he believes dinosaurs roamed the state during the Cretaceous period (145,000,000 BC to 66,000,000 BC).
Devera is particularly interested in finding the bones of duckbilled dinosaurs -- plant-eaters known as hadrosaurs -- because their remains have already been detected in northeastern Missouri. Devera said a researcher got "darn lucky" in Missouri and found dinosaur fossils when a well was being dug. Three kinds of dinosaur fossils have been found in Missouri: Hadrosaurs, Parrosaurus, and a small Tyrannosaurid (perhaps Albertosaurus).
After hours of research, I finally found Tyrannosaurus Rex bones in Illinois. It's SUE, the famous T. Rex we all know and love.
She is no longer featured in the main entrance hall of the Field Museum in Chicago.
SUE is in her new home in the Griffin Halls of Evolving Planet display on the upper level of the Field Museum.
Is it possible to find dinosaur fossils in Illinois?
To find dinosaurs, you need Jurassic or Cretaceous-age rocks. Unfortunately, there are no Jurassic rock outcroppings in Illinois and very little Cretaceous. As you can see, there is just a tiny bit of dark green at the southern point of Illinois and an even smaller patch in western Illinois. These dark green colored locations are mapped as "Undifferentiated" Cretaceous -- which means their age has not been accurately determined yet. It's not hopeful. If the rocks contained common, well-preserved fossils, we would already know their age.
Still, Illinois can boast a significant number of amphibians and invertebrates dating to the Paleozoic Era [2] (541,000,000 BC to 251,900,000), as well as a handful of Pleistocene period (2,600,00 BC to 12,000 BC) pachyderms (Woolly Mammoths, Mastodons and other elephant type mammals). Illinois was geologically unproductive for much of the Mesozoic and Cenozoic Eras (250,000,000 BC to 2,000,000 BC), hence the lack of fossils dating from this vast expanse of time.
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| Woolly Mammoths |
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| American Mastodon |
Joe Devera has been an Illinois State Geological Survey geologist for over 30 years. "Other dinosaurs, such as T-Rex, could be found in Illinois, but they're covered up by vegetation and soil," he said. "People think of dinosaur bones out West because the ground is dry and eroded, and bones are much easier to find," Devera said he believes dinosaurs roamed the state during the Cretaceous period (145,000,000 BC to 66,000,000 BC).
Devera is particularly interested in finding the bones of duckbilled dinosaurs -- plant-eaters known as hadrosaurs -- because their remains have already been detected in northeastern Missouri. Devera said a researcher got "darn lucky" in Missouri and found dinosaur fossils when a well was being dug. Three kinds of dinosaur fossils have been found in Missouri: Hadrosaurs, Parrosaurus, and a small Tyrannosaurid (perhaps Albertosaurus).
After hours of research, I finally found Tyrannosaurus Rex bones in Illinois. It's SUE, the famous T. Rex we all know and love.
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| SUE in the Main Hall of the Field Museum in Chicago. |
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| SUE is in Chicago's Griffin Halls of Evolving Planet of the Field Museum. |
Is it possible to find dinosaur fossils in Illinois?
Compiled by Dr. Neil Gale, Ph.D.
[1] The Mesozoic Era includes the Triassic, Jurassic, and Cretaceous periods.
[2] The Paleozoic Era is the earliest of three geologic eras of the Phanerozoic Eon. It is the longest of the Phanerozoic eras, lasting from 541,000,000 BC to 251,900,000, and is subdivided into six geologic periods: the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.
thank you for ALWAYS having the most educational and interesting articles
ReplyDeleteGreat article. Thank you!
ReplyDeleteFascinating!
ReplyDeleteDINOSAURS WERE GLOBALLY PERVASIVE AND IF WE HAVE DINOSAUR FOSSILS IN MISSOURI-- THEN SO DOES ILLINOIS AS "INACCESSIBLE" AS THEY MAY BE. THAT'S A CHALLENGE!
ReplyDelete