For starters, you can pick up either a Terracotta Warrior or a Chicken Idol, from the Decorations tab of the marketplace, using your accumulated Meteor Credits. As both items are premium items, they are available to users at any level, with the Terracotta Warrior setting you back 250 Credits, while the Chicken Idol costs 350. Both items are available for only the next three days, so make sure to keep that in mind when you’re deciding whether or not to splurge on one or both of them.
Meanwhile, if you’d like to focus on the dinosaur fossil side of the archeological world, you can pick up quite a few fossil pieces, also from the decorations tab of the marketplace. There’s a Sabertooth Skull, claws, spines, ribs, and even a Triceratops Skull has well. The items unfortunately are for users of a higher level, with the Triceratops being unlocked for purchase at level 26, as an example.
Head over to the game’s page to pick up any of these items for use in decorating your island.