The grandest evolutionary disaster of all time

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We know that brontosaurs traveled in herds, sometimes. (dino costume)A rare glimpse into their social structure is provided down at Davenport Ranch, Texas. There the limestone records the passage of two dozen brontosaurs in a compact mass, the very largest prints at the front periphery, the very smallest in the middle of the group. So brontosaur bulls鈥攐r maybe senior cows鈥攎ust have guarded their young against the attacks of the allosaurs. (Realistic dinosaur puppet)The footprints at Davenport Ranch contain a Mesozoic recording of just such a drama of attack and defense, for the three-toed trackways of a great al losaur reveal that it was prowling along the strandline near where the brontosaur had passed.

 

No rock formation provides a richer repertoire of dinosaur stories than the Morrison. Its quarries have been dug from southern Montana to the Cimarron River in Oklahoma, yielding hundreds of skeletons from every level and every fossil habitat. (life size animatronic dinosaur)The sudden extinction of dinosaurs is one of the most popularized topics in paleontology. Why, after all, did the last dynasties finally end in total extinction? In reality, however, the dinosaurs' history contains the drama of much more than a single death. They suffered three or four major catastrophes during their long predominance, each one thinning the ranks of the entire clan. (animatronic dinosaur)And after each such fall, they recouped their evolutionary fortunes, rising again to fill the terrestrial system with yet another wave of new species and families of species. The final complete extermination did not come until sixty-five million years ago, at what geologists label the "Time of Great Dying," the grandest evolutionary disaster of all time.

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