In March 1856 Joseph Leidy wrote a paper describing and naming four kinds of 75-million-year-old reptilian teeth that had been discovered by paleontologist Ferdinand Vandiveer Hayden in Montana. He showed that two of the new reptiles were unquestionably dinosaurs.Thomson...
It would have become colder in the mountains, and new plants would have replaced the warm-weather plants. Van Valen and Sloan have argued that dinosaurs were at a disadvantage in the new forests of coniferous trees. So, they left the mountains and moved toward the tropics, to a better ...
Virtualrealitymayalsoallowpeoplebackin time,toexperiencehistoricalevents,visitancient cities,andeventowalkamongdinosaurs. Finally,inaworldwheremanypeoplesuffer fromstressanddepressionduetooverwork,virtualtourism mayprovideacheapandconvenient wayforpeopletotakebriefholidaystootherwise unreachabledestinationsandrechargetheirba...
The African Megafauna Sea Monsters of the Cretaceous A History of Life on Earth: The Palaeozoic Era 5 Dinosaur Discoveries in the United States Did Dinosaurs Have Feathers or Scales?
Where did dinosaurs live in North America? What was the first dinosaur on Earth? What areas of a dinosaur were feathered? Where are most dinosaur fossils found? Where have dinosaur fossils been found? What dinosaurs lived in Australia?
Brachiosaurus and Apatosaurus are both iconic dinosaurs that roamed during the Late Jurassic period. Brachiosaurus is particularly recognized for its unique physique: its front legs were notably longer than its hind legs, giving it a more upright posture. In contrast, Apatosaurus had legs of a more...
How big were dinosaur eggs? What dinosaurs ate plants? How big was a duck-billed dinosaur? What dinosaurs lived in Tennessee? Which dinosaurs were carnivores? What are dinosaur bones made of? What dinosaurs lived in the Mesozoic era?
InNorth AmericaandEuropethe dinosaurs werehealthy and diverseright up to within about 200,000 yearsof the end-Cretaceous, at which point they disappeared. Mammals and amphibians continued but declined markedly through thefinal 200,000 yearsof the Cretaceous, coinciding with the Deccan eruptions. A ...
What dinosaurs died off before the Cretaceous Period? What era and period is part of the Cretaceous? How did the Devonian period end? What continents were in the Triassic Period? Which was the longest geologic era? What was the atmosphere like in the Triassic period?
Most people believe that the largest animals to ever exist on Earth were the dinosaurs. However, one of the largest land dinosaurs, the sauropod Argentinosaurus, weighed only about 180,000 pounds (81,647 kg). That's little more than half the size of an adult blue whale. It makes a lot...