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Unit 4 lessons 1&2

TermDefinition
Uniformitarianism a principle that geologic proceses that occured in the past can be explained by current geologic processes
Fossil the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
Trace Fossil a fossilized structure, such as a footprint or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment
Climate the weather conditions in an area over a long period of time
Ice Core a long cylinder of ice obtained from drilling through ice caps or ice sheets; used to study past climates
Bands A regular layer to an ice core
Relative Dating any method of determining wether an event or object is older than other events or objects
Superposition a principle that states that younger rocks lie above older rocks if the layers have not been disturbed
Unconformity a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
Geologic Column an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom
Created by: jg.18589
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