. The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917. have lost their world-wide dominancesome time before, as we only know these late Cretaceous forms,doubtful Patagonia excepted, from a few European localitiesand from western North America; but there they were in theclimax of their grandeur and there is little save the tendencyto overspecialization once more to warn the observer of theircoming dissolution. But so far as our records go, not onedinosaur of all the hosts that were survived the Mesozoic, f
. The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917. have lost their world-wide dominancesome time before, as we only know these late Cretaceous forms,doubtful Patagonia excepted, from a few European localitiesand from western North America; but there they were in theclimax of their grandeur and there is little save the tendencyto overspecialization once more to warn the observer of theircoming dissolution. But so far as our records go, not onedinosaur of all the hosts that were survived the Mesozoic, forundoubted post-Cretaceous rocks have not yielded a fragmentof their remains. Why they became extinct no one knows. Our chart showsa lowering of temperature toward the close of the Cretaceous,and to such climatic changes reptiles are highly that may be, the great Laramide revolution whichmarks the close of the Mesozoic must have brought in a longchain of attendant events in consequence of which the dinosaursperished. Of all factors of which we have knowledge, thedraining of the low-lying coastal lands, with a consequent.
Size: 991px × 2521px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorh, bookcentury1900, bookdecade1910, bookpublisheretcetc
