Forms when sediments bury an organism and the sediments change into rock; the organism decays leaving a cavity in the shape of the organism.

forms when a mold is filled with sand or mud that hardens into the shape of the organism.

forms when minerals soak into the buried remains, replacing the remains, and changing them into rock.

forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber.

forms when organisms or parts, like leaves, stems, flowers, fish, are pressed between layers of soft mud or clay that hardens squeezing almost all the decaying organism away leaving the carbon imprint in the rock.

forms when the mud or sand hardens to stone where a footprint, trail, or burrow of an organism was left behind.

life on the planet has progressed from

Scientists order fossils according to age to create the

Fossils can tell us

fossils are not found in any rock layers above where the last one was found show that the organism has

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