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Dnsr notes 23
Sickle-claws and fossil feathers
|What was the climate like in the cretaceous?
|mild, relatively warm even at high latitudes. This happened due to the increased seaways and sea levels.
|What was the sea level like in the cretaceous?
|Many major landmasses were separate from one another, although some did have persistent connections due to the changing sea levels. Sea levels were relatively high.
|What divided North America into an eastern and western side?
|Cretaceous Interior Seaway
|During the Early Cretaceous, dinos from North America suggested links with what continents?
|Western Europe and Asia
|What were plants like in the Early Cretaceous?
|Similar to the Jurassic with a diverse variety of pteridophytes (ferns and horsetails) and gymnosperms.
|What was significant about plant life at the end of the early cretaceous?
|Angiosperms, or flowering plants appeared and rapidly achieved dominance.
|How many species of angiosperms exist and dominate today?
|220,000 known species
|What characteristics did angiosperms hold?
|occupied a wider range of habitats, achieved a broad range of sizes and heights, recovered quickly from damage, and had fewer chemical and mechanical impediments to digestion.
|Which groups of sauropods dominated which times in the cretaceous?
|Early cretaceous, brachiosaurus. Late cretaceous, titanosaurus
|Theropods diversified dramatically during the cretaceous, bringing in what groups?
|utahraptor, therizinosaurs, giganotosaurus, baryonyx
|Which of the theropods was dominant?
|Which thyrophorean diversified?
|Which ornithopod groups diversified?
|Early cretaceous: hypsilophodonts and iguanodonts. Late cretaceous: Hadrosaurs
|Which marginocephalians diversified?
|Pachycephalosaur and Ceratopsians. They ranged from small-bodied psittacosaurs, to mid-sized protoceratopsians and massive ceratopsids.
|Which assemblage in Yixian, China, preserves an entire ecosystem?
|What are some dinosaurs that Jehol Biota preserved?
|Confuciusornis, Sinosauropteryx, Dilong and Yutyrannus (feathered), therizinosaur, beipiaosaurus. Oviraptor, Caudipteryx. The dromaeosaurids sinornithosaurus. The troodontids Mei and sinovenator
|What formation does Utah have and how old are the rocks?
|Cedar Mountain Formation and the rocks are 128 to 100 million years old
|Name some dinos found in the cedar mountain formation?
|Utahraptor, falcarius, abydosaurus, brontomerus, cedarosaurus, eolambia, hippodraco, iguanacolossus along with many turtles, crocs, mammals, and lizards