National Geographic : 1998 Dec
Dingus hopes that he can narrow the range by about six million years. The rocks also give us a rough idea of how these bad lands looked during the late Cretaceous. Egg clusters, like the nearly five-foot-long grouping below, rested on a gently sloping floodplain (opposite). In some years streams probably topped their banks, drowning the embryos. In other years the dinosaurs survived to become ..- . * hatchlings about 15 inches *" . * long, growing into adults that S. . .- were up to 45 feet long. *." - . " . a As Coria points out, * - . * "behavior rarely gets fossil .. -s" s. ized," so we don't know if the S-s " - Ia hatchlings relied on adults for S- - - - care, but we do know what S- * a . - they probably looked like, *a a - thanks to the rare fossils S- a. a found at Auca Mahuevo. .* aa a Future expeditions to this . - aa enormously rich site will help . -s . - . complete the picture that we S- - . have only begun to draw. Q - These dinosaurs and many more . - a^- can be found at www.nationalgeo a " - a - a a- graphic.com/dinorama.