footprint:mark left by the passing foot of a person or animal

preserved to keep something as it is

mineral:rocks or crystals that are normally buried

carbon:the chemical element of atomic number 6, a nonmetal which has two main forms

mold:surface that is used so that something has the best shape made

horseshoe: a usually U-shaped band of iron fitted and nailed to the rim of a horse's hoof to protect it.

fish;a small animal, live in the water

trilobite:an extinct marine arthropod that occurred abundantly during the Paleozoic era, with a carapace over the forepart, and a segmented hind part divided longitudinally into three lobes.

fossil: animals bone

amber:hard translucent fossilized resin produced by extinct coniferous trees of the Tertiary period, typically yellowish in color.

dinosaur:a animal prehistoric

sponge:a primitive sedentary aquatic invertebrate with a soft porous body that is typically supported by a framework of fibers or calcareous or glassy spicules. Sponges draw in a current of water to extract nutrients and oxygen.