Visit Your Local PBS Station PBS Home PBS Home Programs A-Z TV Schedules Watch Video Donate Shop PBS Search PBS
Click to return to the Evolution Home Page
darwin change extinction survival sex humans religion
mass extinction    
What Killed the Dinosaurs? Source Credits

Three-dimensional Bouguer gravity anomaly map over the Chicxulub crater
Mark Pilkington, Geological Survey of Canada

Unaltered tektite glass, separated from the Cretaceous-Tertiary ejecta layer, as preserved at the Mimbral locality, Tamaulipas state, Mexico
Courtesy Alan Hildebrand

A 0.32 mm shocked quartz grain from intracrater breccia sample Y6 N14 of the Chicxulub crater
Courtesy Alan Hildebrand

Outcrop of strata crossing the Cretaceous-Tertiary (K/T) boundary at Brazos River, Falls County, Texas
Courtesy Alan Hildebrand

Deccan Plateau
Courtesy NASA JSC Digital Image Collection

Trilobite fossil
Copyright Protection Notice: © Dewitt Jones/CORBIS

A Hypacrosaurus dinosaur fossil from the Cretaceous era
Copyright Protection Notice: © Kevin Schafer/CORBIS

Cretaceous Gryposaurus dinosaur fossil
Copyright Protection Notice: © Kevin Schafer/CORBIS
  related web activities  
Riddle of the Bones
Piece together clues about our early ancestors.
A Modern Mass Extinction?
Are we in the midst of one? And if so, did we trigger it?
Deep Time
Explore 4 billion years of life on Earth.
  related topics  
  Deep Time/History of Life  
  What Is Science?  
  Evidence for Evolution  
Videos Web Activities Site Guide About the Project FAQ Glossary Site Map Feedback Help Shop