After visiting the Orton Hall Geology Museum on the OSU campus, we made our own fossil posters. The kids used a plastic skeleton of a dinosaur and a seashell to make the four different kinds of fossils!
Mold Fossil: A depressed mold, indentation of animal/plant.
Cast Fossil: A filled in mold, mud or other things filled in the fossil and left the imprint.
Trace Fossil: Evidence of something they left behind, scat, tracks, etc.
True Form Fossil: The entire animal/plant is fossilized.