For STEAM-filled fun, simply have kids fill these fossil molds with with papier-mâché to showcase the intricate details of ammonite, chirostenotes claw, trilobite, king crab, and gyrodus creatures . Let dry and pop out molds to decorate with paints and glitter for an added effect. Fill with with resin or other weather-resistant materials and bury outside for kids to uncover in their very own archaeological exploration!