Welcome to the Jurassic Period!
The Jurassic Period is one of three periods that occurred during the Mesozoic Era—the age of reptiles—when dinosaurs roamed the earth.
- Triassic Period—252-201 million years ago
- Jurassic Period—201-145 million years ago
- Cretaceous Period—146-66 million years ago
The dinosaurs currently on display in DinosphereⓇ, including Tyrannosaurus rex, are from the Cretaceous Period. The fossils we are recovering from the Jurassic Mile are from the Jurassic Period—a period when dinosaurs exploded in diversity of size and shape. Some would become truly massive, including the legendary “long neck” dinosaurs, like the specimens found at The Jurassic Mile.
Dinosaur Fossils we might find in the Morrison Formation
The Morrison Formation is a huge packet of rocks that runs from Montana to New Mexico. Dinosaurs of all shapes and sizes from the Late Jurassic Period are found in these rocks.
At the Jurassic Mile we are currently excavating Theropods, predatory, carnivorous dinosaurs who typically stood on two feet, and Sauropods, long-necked, long-tailed four-legged herbivorous dinosaurs that were giants in size. Besides the massive bones, we have also found evidence of inchnofossils—footprints, burrows, nests, and even dung!
Marine Fossils we might find in the Sundance Sea
The Sundance Formation consists of rocks that are slightly older than the Morrison Formation and were deposited in an inland sea called the Sundance Sea. During the Late Jurassic Period the seas teemed with a huge variety of life. Marine reptiles often grew to the size of large dinosaurs. These were some of the biggest and most fearsome creatures to have ever lived, including the bizarre Liopleurodon—which grew up to 33 feet long and lived in the seas off the coast of what is now the U.K.