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Dnsr notes 23
Sickle-claws and fossil feathers
| Question | Answer |
|---|---|
| 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? | Tyrannosaurs |
| Which thyrophorean diversified? | Anklyosaur |
| 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? | Jehol Biota |
| 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 |
Created by:
Chelseagirl2508
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