The existential periods of all the giant lizards overlap and their remains have been found in different geological strata. Why does the "falling asteroid" theory have more media and Hollywood support? Because it sells. You can shoot a movie and make millions of dollars based on a theory that sounds catastrophic and "spectacular". So, greediness goes against scientific objectivity. It is true that the Earth has been hit by outer space objects throughout its history, though, but the meteorite that impacted against the Yucatan peninsula in the late Cretaceous did not cause a cataclysmic event strong and intense enough to wipe out all the dinosaurs at once; for fossil bones of Hadrosaurus, Anklyosaurus, and even Tyrannosaurus were found in the Paleocene stratum. Their existence overlapped with the emergence of warm-blooded creatures like birds and mammals. The Paleocene period of the Cenozoic era follows the Cretaceous.
Dust and sediments caused by a violent natural event settle much faster than many think. For example, the eruption of Mount St Helens in Washington State in 1980 is calculated to be event stronger in liberation of energy as when the Earth was hit by a meteorite on the Yucatan peninsula; however the volcano eruption ash spread only throughout six States and it settled down in less than six weeks. For Hollywood and cable TV programs, it is very boring to say that all dinosaurs have gradually became extinct due to a slow and steady cooling of the Earth temperature and biological circumstances, such as fighting for the survival, but for scientists it should not. Wake up! Break out of the shell!
By Carlos B Camacho