dinosaur summary
Learn how dinosaurs are classified and what caused their extinction
Below is the article summary. For the full article, see dinosaur.
Archaeopteryx Summary
Archaeopteryx, genus of feathered dinosaur that was once thought to be the oldest known fossil bird. The specimens date to approximately 150 million years ago, during the Late Jurassic Epoch (163.5 million to 145 million years ago), and all were found in the Solnhofen Limestone Formation in