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Science Terms

A fossilized mark that is formed in soft sediment by the movement of an animal
A mark or cavity made in a sedimentary surface by a shell or other body
The time needed for half of a sample of a radioactive substance to undergo radioactive decay
The largest division of geologic time
A break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
The process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element
A principle that states that geologic processes that occurred in the past can be explained by current geologic processes
A unit of geologic time into which eras are divided
A principle that states that geologic change occurs suddenly
The scientific study of fossils
An arrangement of rock layers in which the oldest rocks are at the bottom
A type of fossil that forms when sediment fill in the cavity left by a decomposed organism
A principle that states that younger rocks lie above older rocks if the layers have not been disturbed
The remains or physical evidence of an organism preserved by geological processes
Any method of measuring the age of an event or object in years
A subdivision of a geologic period
The standard method used to divide the Earth's long natural history into manageable parts
Any method of determining whether an event or object is older or younger than other events objects
A fossil that is found in the rock layers of only one geologic age and that is used to establish the age of the rock layers
A unit of geologic time that includes two or more periods