Mean atmospheric O2
Geologic Time Scale
Diplodocus and pterodactyls
Dinosaur sauropods of the genus Diplodocus leisurely graze on sparse vegetation while several pterodactyls pass overhead 150 million years ago in what is today North America. 115 feet long and weighing over 10 tons, from the tip of tail to its diminutive head Diplodocus is the longest known dinosaur.
Copyright © Walter Myers. All rights reserved.
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