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Unit 5 Fossils

Rocks Provide clues to Earth's past
Fossils preserved remains or evidence of ancient living organisms
catastrophism the idea that conditions and creatures on Earth change because of quick, violent events
uniformitarianism the same geologic processes that occur today occurred in the past
cast when a mold fills with sediment or mineral deposits
paleontologists scientists who study fossils
superposition oldest rocks are on bottom when rock layers are undisturbed
original horizontality rock layers might tilt, but they were first deposited horizontally
lateral continuity layers are deposited in continuous sheets in all directions until they thin out or hit a barrier
unconformity surface where rock has eroded away, producing a break, or gap in rock record
cross-cutting relations younger geologic features cut across older geologic features
correlation matching rocks and fossils from separate locations
inclusions pieces of older rock becomes part of new rock
index fossils represent species existed on Earth for a short time, where abundant and inhabited many locations
relative age tells us how old something is compared to another thing or which came first
absolute age tells us how old in years something is
law of superposition states that rock layers are laid down in order from oldest to newest
extrusion lava that hardens on the surface
half-life the amount of time it takes for half of the unstable atoms in a sample to decay
isotope atoms of an element that contains different number of NEUTRONS
Created by: LOJHcmatthews
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