East Asia, China, Cretaceous Period, ca. 145 to 66 million years ago. A round, fossilized dinosaur egg from a red sandstone formation. The shell structures are nicely preserved. The round shape tells us that this egg belonged to an herbivorous dinosaur, a member of the sauropod family. Although it looks huge compared to many modern eggs, it is mid-sized for a dinosaur - the largest sauropod eggs are twice this size (and yielded animals who could grow to be nearly a hundred tons!). The Auca Mahuevo site in Argentina contains the best known excavated sauropod egg clutches, and from there we know that they laid 20-40 eggs in sandy depressions that served as their nests. They did not cover them in sand or vegetation; instead, they relied on the sun and proximity to other eggs to incubate them. It is amazing to realize that an egg this size could grow a massive animal - but studies on bones have shown that juvenile sauropods grew as much as two tons per year. Footprints give us evidence that sauropod parents kept a close eye on their offspring after they hatched. Size: 6.1" W x 5.75" H (15.5 cm x 14.6 cm)
Provenance: private southwestern Pennsylvania, USA collection
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#148037
Condition
Shell is fragmentary as shown and has been repaired in a few places. It is partially preserved in its matrix. Form is still clear.