It's fossil time, yo.
Have:
T. Rex Skull x2
Parasaur Tail x2
Apato Torso
Dinosaur Egg
Iguanodon Skull
Trilobite x2
Ptera Skull
Stego Torso
Mammoth Torso
Ankylo Skull
Megacero Tail
Megacero Skull
Apato Tail
Mammoth Skull
Shark Tooth
Need:
Pachysaurus Skull
Spinosaurus Tail
Right Ptera Wing
Ankylo Tail
Dimetrodon Skull
Dimetrodon Tail
Diplo Skull
Ichthyosaur Tail
Whatever is in-between the Fern Fossil and the Archeopteryx
Whatever is in-between the Coprolite and the Shark Tooth
My Spino Tail for your Megacero Skull?