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fossils

Stack #198076

QuestionAnswer
a priceible that states that the geologic process that occerd in the past can be explained in cerrent geologic prosses uniformitarianism
a princible that states that geologic chang occers suddenly catastrophism
the seintific study of fossils paleontology
Any method of determining whether an event or object is older or younger than other events or objects relative dating
a princeible that states that younger rock lie above older rockif the layers have not been disterbed superposition
An arrangement of rock layers in which the oldest rocks are at the bottom geologic column
a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time unconformity
Any method of mesuring the age of an event or object in years Absolute dating
an atom that has the same number of protonsas other atoms of the same element do but that has a diffrent numder of neutrons isotope
The process in which a radio active isotope tents to break down into a stable isotope of the same element or another element Radioactive decay
a method of determoning the age of an objeckt by estimating the relitive percentage of a radioactive isotopeand a stable (daughter) isotope radiomertis dating
The time Needed for half of a sample of a radioactive substance to undergo radioactive decay Half-Life
the trace or remains of an organism that lived long ago most comonly perserved in sedimentary rock. fossil
A fossilized mark that is formed in soft sediment by the movment of an animal Trace fossil
a mark or cavity made in a sedimentary surface by a shell or other body mold
a type of fossil that forms when sediments fill in the caviy left by a decomposed oragnism cast
a fossil that is found in the rock layers of only 1 geologicage that is used to establish the age of the rock layers index fossil
The Standard method used to divide the earths long natural history into mangeable parts Geologic time scale
the largist divishon of geologic time eon
a unit of geoglic time period period
a unit of geologic time that includes 2 or more periods era
a subdivision of a geologic period epoch
the death of evry member of a species extinction
Created by: headrick/holgate
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