Category: dinosaurs...

finding a dinosaur bone
the dinosaurs in New York's American Museum of Natural History
the late Triassic to the Cretaceous Period, when one lineage of dinosaurs evolved into birds
the name from Greek translating to terrible/fearfully great lizard - now more than 800 generic ones and 1000 species (about 10-25% actual)
abundant fossil remains from every continent, though this constitutes less than 0.0001 percent of all the individual dinosaurs that once lived
the Greco-Roman legends about griffins from the 7th century BC were inspired by protoceratopsian fossils in the Altai of Mongolia - though people could not have been expected to know what dinosaurs were even if the found remains
Lewis and Clark's expedition encountering dinosaur fossils
the earliest verifiable published record of dinosaur remains in the U.S. described those found in 1818 in Windsor, Connecticut
Dinosaurs became extinct after the collision of an asteroid with Earth, at a point on the northwest coastline of the Yucatan Peninsula in Mexico. A crater 106 miles across formed, shooting billions of tons of matter into the atmosphere, which blotted out the Sun and caused global temperatures to plummet.