Geo Ch 9 – Flashcards
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What is a fossil?
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Evidence of past life that can include skeletal as well as trace material
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________ is a term used to define 88% of Earth's history prior to the start of the Paleozoic Era.
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Precambrian
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The fossil record is biased toward preserving organisms with hard parts.
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True
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A mammoth frozen in the Arctic tundra of Siberia would be an example of which type of fossilization?
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Mummification
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Match the relative dating principles with the correct definition. Unconformities
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Missing Time
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When correlating rock between widely separated areas or between continents, what feature do geologists rely on the most?
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Fossils
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Which era are we currently in?
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Cenozoic
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The first life on Earth developed during the Cambrian Period.
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False
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What is an index fossil?
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Organisms that were geographically widespread but limited to a short span of geologic time
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Match the relative dating principles with the correct definition. Lateral Continuity
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Rock extend in all directions until they reach the edge of a basin or pinch out
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Match the relative dating principles with the correct definition. Superposition
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The oldest is on the bottom, the youngest on top
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What is correlation?
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Matching up rocks of similar age in different regions
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In cast and mold fossilization, the cast is the hollow space in the rock that subsequently becomes filled with mineral matter.
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False
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Match the relative dating principles with the correct definition. Inclusions
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Chunks of weathered rock are older than the rock they are contained in
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A worm burrow is an example of which type of fossilization?
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Trace Fossil
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Match the relative dating principles with the correct definition. Cross-Cutting Relationships
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Faults, fractures are younger than the rocks they cut through
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What is the definition of relative dating?
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Putting events in order from first to last
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Match the relative dating principles with the correct definition. Original Horizontality
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Sedimentary layers/lava flows are deposited in flat layers
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Rapid burial is an important condition favoring preservation.
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True
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What is an isotope?
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An atom that has more or fewer neutrons than it should
