June 28. We find the third maiasaur nesting ground at Egg Gulch. July, August. We take another 50 tons of rock off Egg Mountain, and we continue to remove fossils from different parts of the big bone bed. September 14. At the very end of the season we find Egg Island, another colonial nesting ground of Orodromeus makelai. In one of the two clutches. on the surface, are 19 fossilized dinosaur embryos, the first ever found.

1984. We take another 30 tons off Egg Mountain. The completed excavation yields a total of 12 hypsilophodontid egg clutches in three nesting grounds, as well as fossils of plants, lizards and mammals, and two unidentified kinds of eggs—one apparently from a dinosaur, the other of unknown origin.

September. Will Gavin finds an ash layer common to the Brandvold site, Camposaur and similar deposits. All are clearly connected, confirming that we have one big bone bed. It seems that hot gases from a volcanic eruption killed the herd.

1985. During the winter, Jill Peterson and I go to Paris to study under Armand de Ricqles and learn more about the tissue of fossilized dinosaur bone. The hope is to develop positive evidence that dinosaurs were warmblooded. The next summer we will begin the search, at new sites, for more baby dinosaurs.

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