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Beseen.com


March 2001

 


by krstl kitten

 

Triassic, Jurassic, Cretaceous? What are these? No, they are not sequels to movies, they are the names of different periods of time in our Earth's history. They are the times when great dinosaurs and other fascinating creatures lived. At 46 years old, I'm hardly a kid anymore, but in researching this article, I'm beginning to see what my nieces and nephews find so interesting about these animals.
I hope you do, too!

Let's begin with the Allosaurus, nicknamed the "Different Lizard". Found on Earth during the Jurassic period, the Allosaurus lived over 160 million years ago!! I don't know about you, but I can't even begin to imagine that many years. These animals
were 35 to 40 feet long with teeth that were 4 inches long and toenails in serious need of a manicure at 6 inches long! Okay, so dinosaurs don't have toenails, they have claws...a mere technicality. They weighed anywhere from 2 tons to over 5 tons. In today's terms, that would be somewhere between an elephant and an adult river hippo. More than 60 complete and partial Allosaurus skeletons have been unearthed in the United States....more than any other fossil.

The Coelophysis was a fast reptile from the Triassic period. That makes him older than our buddy with the toenail problem. His nickname was "Skinny Bones", and he
was all of about 50 to 60 pounds. At 9 to 10 feet long, I think we know where he got his nickname! Built for speed, this dinosaur had lots of sharp little teeth. He was also thought to be cannibalistic. Okay, now that's just gross to me! Couldn't they just make a salad or something? Anyway, there were hundreds of Coelophysis skeletons found in Ghost Ranch, New Mexico in 1947. They were all huddled together, and scientists believe they died in a great flood.

Speaking of floods, our next specimen was the first amphibian. Nicknamed "Kool's Crocodile", the Koolasuchus lived during the early part of the Cretaceous period. This kool dude was able to walk on land, but he preferred the water. He had a huge head and a very big mouth. Hey! I'm not talking about your brother here! Stop that giggling and pay attention, please. The Koolasuchus was about 16 feet long. That's longer than a Volkswagen Beetle. He had kind of a seafood diet, but he was known to eat baby dinosaurs, too. Two fossils of Koolasuchus jaw bones were found in Australia in 1989. Each bone was over two feet long!!

Well, I don't know about you, but I'm looking forward to learning more about the animals that roamed the earth and skies millions of years ago. Take a look at kids.discovery.com and see what other animals lived during these three important times in history!