Mold fossil, Type of fossil that forms when sediments bury an organism and the sediments change into rock., Petrified fossil (permineralized fossil), Type of fossil that forms when minerals soak into the buried remains, replacing the remains, and changing them into rock., Preserved fossil, Type of fossil that forms when entire organisms or parts of organisms are prevented from decaying by being trapped in rock, ice, tar, or amber., Trace Fossil, Type of fossil that forms when the mud or sand hardens to stone where a footprint, trail, or burrow of an organism was left behind., Relative Age, What term do we use to compare the age of one object to the age of another object?, Law Of Superstition , What law states that each rock layer is older than the one above it?, In sedimentary rocks, Where are most fossils formed?, On top of older rocks, Sedimentary rocks pile up one atop the other. According to the Law of Superposition, younger rocks lie where?, On top of older fossils, According to the Law of Superposition, younger fossils lie where?, trilobite, What is a key example of an index fossil?, Ordering of rock layers and Index fossils, What are the two basic methods to determine the relative age of rocks and fossils?, If the rock or fossil is farther down in the rock layers., Using the law of superposition (layering), the relative age of the rock or fossil in the rock is older if what?.

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