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Lecture Notes for GLY 130 - DINOSAURS & DISASTERS with Greb at Kentucky (UK)

Notes Information

Material Type:Study Guide
Professor:Greb
Class:GLY 130 - DINOSAURS & DISASTERS
Subject:Geological Sciences
University:University of Kentucky
Term:Fall 2008
Keywords:
  • Haversian Canals
  • Erect Posture
  • Behind (of)
  • Brachiopods
  • Specialized
  • Trace Fossil
  • Terrestrial
  • Asymmetrical
  • Polar Regions
  • Relationships
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Sample Document Text

Study Guide For Dinosaurs and Disasters Exam #2 After the Permian Extinction: • Adaptive Radiation: evolutionary divergence of numbers of a single phyletic line into a series of different niches or adaptive zones ○ Niches: relatively rapid (in geologic time) adaptations  Faster than normal background rate of adaptations  Many new species develop in a short period of time • Tend to follow mass extinctions • How does adaptive radiation fit in with the concept of natural selection? Synapsids and Diapsids Before and After the Extinction  Synapsids: mammal-like reptiles with hole behind eye ○ Numerous families, species in many niches ○ Just survive ○ Those that make it eventually lead to mammals  Diapsids: mammal-like reptiles with 2 holes behind eye ○ Only a few families ○ Extinction event was to their benefit ○ Several families develop ○ They fill most niches (land, sea, and air). ○ Originated in the Permian, before the mass extinction, but not the dominant type of reptiles. ...

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