Re-order paragraphs

d) No one has yet excavated a complete dinosaur skeleton from this site or anywhere else in Alaska.

c) Nevertheless, my group and other paleontologists have been able to identify from partial skeletons, isolated bones, teeth and fossil footprints eight types of dinosaurs that lived as contemporaries in the far north.

b) All eight date to the Cretaceous period, which lasted from 145 million to 65 million years ago.

a) Most come from just the last few million years of the period, 75 million to 70 million years ago, some five million years before the famous mass demise of the planet’s dinosaurs.