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Fossils Mr.Lewis

Study stack fossils Mr.Lewis RMS

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.
Created by: abramssele