Federal agents seized tons of fossilized dinosaur eggs, pine cones and other artifacts at the nation's largest gem show after determining the items had been smuggled out of Argentina.

Authorities said three small watermelon-sized eggs and 14,400 pounds of prehistoric pine cones, crab claws and other artifacts belonged to the Argentine government.

Federal agents took digital photos of the artifacts at Tucson's Gem, Mineral and Fossil Showcase earlier this month and conferred with Argentine paleontologists after getting a tip that a vendor was selling fossils of significant scientific value.

No immediate arrests were made.