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Fossils Mr.Lewis
Study stack fossils Mr.Lewis RMS
Term | Definition |
---|---|
Uniformitarianism | A principle that states that Geologic processes that occured in the past can be explained by current geologic processes. |
Catastrophism | A principle that states that geologic change occurs suddenly. |
Paleontology | The scientific study of fossils. |
Relative dating | Any method of determining wether an event or object is older or younger than other events or objects. |
Law of Superposition | The principle that states that younger rock lie above older rocks in undisturbed. |
Geologic column | An idea sequence of rock layers that contain all known fossils/rock formations on earth arranged from oldest to youngest. |
Absolute dating | A method of measuring the age of an event or object in years. |
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. |
Fossil | Remains or physical evidence of an organism preserved by geological processes. |
Mold | A mark or cavity made in a sedimentary surface by a shell or other body. |
Cast | A type of fossil that forms when sediments fill in the cavity left by a decomposed organism. |
Index fossil | 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. |
Original horizontality | States that most rocks form in layers horizontally. |
Extinct | The death of every member of a species. |
Geology time scale | Standard method used to divide. |