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CHAPTER 6!!

fossils

QuestionAnswer
The death of every member of a species Extinction
A subdivision of a geological period Epoch
A unit of geological time into which eras are divided Period
A unit of geologic time that includes two or more periods Era
The largest division of geologic time Eon
The standard method used to divide the earth's long natural history into manageable parts Geologic time scale
A fossil that is found in the rock layers of only one geologic age and that is used to establish the age of rocks Index Fossil
A type of fossil that forms when sediments fill in cavity left by a decomposed organism Cast
A mark or cavity made in sedimentary surface by a shell or other body Mold
A fossilized mark that is formed in a soft sediment by the movement of an animal Trace Fossil
The trace of remains an organism that lived long ago most commonly preserved in sedimentary rock Fossil
The time needed for half of a sample of radioactive substance to undergo radioactive decay Half-Life
A method of determining of the age of an object by estimating the relative percentages of a radioactive (parent) isotope and a stable (daughter) isotope Radiometric Dating
The process in which radioactive isotope tends to break down into stable isotope of the same element or another element Radioactive Decay
An atom that has the same number of protons (or the same atomic number) as other atoms of the same element do but that has a different numbers of neutrons (and thus a different mass) Isotope
Any method of measuring the age of an event or object in years Absolute Dating
A break in geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time Unconformity
An arrangement of rock layers in which the oldest rocks are at the bottom Geologic column
A principle that states that younger rock lies above older rocks if the layers have not been disturbed Superposition
Any method of determinig whether an event or object is older or younger than other events or objects Relative Dating
The scientific study of fossils Paleontology
A principle that states that geologic change occurs suddenly Castrophism
A principle that states geologic processes that occured in the past can be explained by current geologic processes Uniformitarianism
Created by: mediroskaylie
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