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Dnsr notes 23

Sickle-claws and fossil feathers

QuestionAnswer
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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