crab: any decapod crustacean of the suborder Brachyura, having the eyes on short stalks and a short, broad, more or less flattened body, the abdomen being small and folded under the thorax.

tar: any of various dark-colored viscid products obtained by the destructive distillation of certain organic substances, as coal or wood.

trace: a surviving mark, sign, or evidence of the former existence, influence, or action of some agent or event;vestige:

fossil: any remains, impression, or trace of a living thing of a former geologic age, as a skeleton, footprint, etc.

mold: a hollow form or matrix for giving a particular shape to something in a molten or plastic state.

sand: Sand is defined as small, loose, gritty particles of rock, or an area with these small particles.

cast: A stroke of fortune or fate; a lot.

mineral: any of a class of substances occurring in nature, usually comprising inorganic substances, as quartz or feldspar, of definite chemical composition and usually of definite crystal structure, but sometimes also including rocks formed

sponge: to wipe or rub with or as with a wet sponge, as to moisten or clean.

coal: a black or dark-brown combustible mineral substance consisting of carbonized vegetable matter, used as a fuel.:Compare anthracite, bituminous coal, lignite.

trilobite: any aquatic, chiefly marine animal of the phylum Porifera, having a porous structure and usually a horny, siliceous or calcareous internal skeleton or framework, occurring in large, sessile colonies.

preserved: to keep alive or in existence; make lasting: