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The Upper Jurassic: A Time of Giants!

Imagine a world with giant dinosaurs and vast oceans! That was the Upper Jurassic, a super-long time ago!

Images

Diplodocus sauropod dinosaurs (Morrison Formation, Upper Jurassic; Mother's Day Site, Carbon County, southern Montana, USA) 2

Diplodocus sauropod dinosaurs (Morrison Formation, Upper Jurassic; Mother's Day Site, Carbon County, southern Montana, USA) 2

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Diplodocus sp. juvenile leg (center) (Morrison Formation, Upper Jurassic; Mother's Day Site, Carbon County, southern Montana, USA)
Katroliceras matsumotoi (fossil ammonite) (Upper Jurassic; Moronodova, Madagascar) 1
Infant Apatosaurus dinosaur tracks (Morrison Formation, Upper Jurassic; Quarry 5, Dinosaur Ridge, west of Denver, north-central Colorado, USA) 2
Mamenchisaurus hochuanensis sauropod dinosaur (Shangshaximiao Formation, Upper Jurassic; Gushushan, NW of Hechuan, southwestern Chongqing Municipality, south-central China) 1
Dinosaur bone in sandstone (Morrison Formation, Upper Jurassic; western side of Dinosaur Ridge, Colorado, USA) 3
Allosaurus atrox theropod dinosaur (Morrison Formation, Upper Jurassic; Cleveland-Lloyd Quarry, northern Emery County, east-central Utah, USA) 6
Apatosaurus ajax sauropod dinosaur (Morrison Formation, Upper Jurassic; Emery County, Utah, USA) 2
Ammonite fossil with in-situ aptychi (Solnhofen Limestone, Upper Jurassic; Bavaria, Germany) 2
Juvenile Stegosaurus dinosaur footprints in sandstone (Morrison Formation, Upper Jurassic; Quarry 5, Dinosaur Ridge, west of Denver, north-central Colorado, USA)
Camarasaurus lentus sauropod dinosaur (Morrison Formation, Upper Jurassic; Carnegie Quarry, Dinosaur National Monument, northeastern Utah, USA) 1
Comatula pinnata (fossil crinoid) (Solnhofen Limestone, Upper Jurassic; Bavaria, Germany) 4

Key Facts

Time Period
Approximately 157 to 145 million years ago.
Famous Dinosaurs
Allosaurus, Brachiosaurus, Stegosaurus.
Ocean Dwellers
Plesiosaurus, Ichthyosaurus.
What We Find
Fossils of dinosaurs, marine reptiles, and ancient plants.

Welcome to the Jurassic Party!

The Upper Jurassic was a special time, like a chapter in Earth's super-long storybook. It happened about 157 to 145 million years ago. That's way, way, WAY before even the dinosaurs' best friends, the mammoths, showed up!

During this time, the continents looked different, and the weather was warm and cozy. It was a perfect time for big adventures and even bigger creatures to roam the land and swim in the seas.

Meet the Dino Stars!

This was the golden age for some of the most famous dinosaurs! Think of the mighty Allosaurus, a fierce hunter with sharp teeth, or the gentle giant Brachiosaurus, whose neck was longer than a school bus! There were also Stegosaurus with their cool plates and spiky tails.

These amazing animals lived in lush forests and open plains, munching on plants or chasing their dinner. It was a busy time with lots of different kinds of dinosaurs living together.

Ocean Adventures!

It wasn't just dinosaurs on land! The oceans were also full of incredible life. Giant marine reptiles like the long-necked Plesiosaurus and the speedy Ichthyosaurus, which looked a bit like dolphins, swam through the warm seas.

These creatures were the kings and queens of the underwater world, hunting fish and other sea animals. Imagine swimming next to them – it would be like being in a real-life ocean documentary!

What's Left Behind?

How do we know about this ancient time? Scientists find clues in rocks! Fossils, like dinosaur bones and shells, are like puzzle pieces from the past. By studying these fossils, we learn about the plants, animals, and even the weather of the Upper Jurassic. It's like being a detective, piecing together what life was like millions of years ago, helping us understand our planet's amazing history.

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Based on content from Wikipedia · Licensed under CC BY-SA 4.0