C. MUNOZ-YAGUE / EURELIOS / SCIENCE PHOTO LIBRARY C. MUNOZ-YAGUE / EURELIOS / SCIENCE PHOTO LIBRARY
Measuring dinosaur eggs. Palaeontologists Dr J.L. Sanz (at left) and J. Moratalla measure fossilised eggs laid in a dinosaur nest they discovered. Egg diameter is about 20 centimetres. These eggs come from the Tremp basin, South Central Pyrenees in Spain. The site known as Bastus is among the rich- est deposits of dinosaur eggs. About 300 000 eggs are preserved in 12 000 cubic metres of rock. At the time of the Upper Cretaceous (65-100 million years ago) when these dinosaurs lived, the site was located at the seashore. This nesting ground was probably visited regularly by the dinosaurs. Researchers from the University of Madrid, Spain.
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