Herds of sauropods migrated across this landscape

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When the pioneers headed west across North America in the late nineteenth century, they found the bones of strange animals.(dinosaur exhibiton suppliers) The finds drew the attention of scientists who, within 30 years,discovered more than 100 previously unknown dinosaur types. Most came from a sequence of rocks called the Morrison Formation, which was formed from river sediments in late Jurassic times. The landscape was once that of a riparian forest. In the late Jurassic a shallow seaway stretched north-south along the length of the North American continent. To the west the ancestral Rocky Mountains arose along the edge of the ocean. (animatronic dinosaur)Between the two stretched a plain built up of sediment washed down from the mountains. Rivers meandered across the plain, flooding frequently and depositing sediment. In times of flood, the sediment built up on the riverbanks, forming levees, until the surface of the river became higher than the elevation of the surrounding plain. The water frequently broke through the levees spreading sediment in a fan-shaped deposit, and river water often seeped through the levees as springs filled freshwater ponds and lakes across the plain. Other lakes, formed at times of flood, dried out and became poisonous with alkaline minerals leached from the soil.


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On this topographic surface the plants were confined largely to the river banks and around the freshwater pools. The plants formed forests and isolated stands of primitive conifers and ginkgos, with a lower- storey of cycad-like plants and tree ferns, and an undergrowth of ferns and beds of horsetails close to the water. (walking dinosaur costume)The open plain had a scrappy growth of ferns. The alkaline pools were barren. The climate was seasonal with dry periods interrupted by times of abundant rain.

Herds of sauropods migrated across this landscape. Diplodocus, Apatosaurus, Camarasaurus, Brachiosaurus and many others, moved from thicket to thicket wherever there was food. The plated Stegosaurus fed from the trees and undergrowth. The main ornithopod was Camptosaurus. There were theropods aplenty, ranging from the enormous Allosaurusy through the medium-size Ceratosaurus to smaller animals like Ornitholestes and Coelurus. The abundant fossil remains of these dinosaurs are found mostly as isolated bones in flood deposits, but there are also associated skeletons and articulated skeletons in river channel deposits.