Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account


the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil


gradual change of the original substances of an organism dissolve and are replaced by minerals from the water (turned to stone)


a fossil formed when an organism buried in sediment dissolves, leaving a hollow area


the type of fossil that forms when a mold becomes filled in with minerals that harden. the cast takes on the shape of the mold creating a replica of the organism or part.


a hard yellowish to brownish translucent fossil resin


Thin object falls into sediment can leave an imprint when sediment hardens.

tar pit

large pools in Southern California that contain fossil remains of many different animals

trace fossil

a type of fossil that provides evidence of the activities of ancient organisms


to develop gradually by process of growth and change


term used to refer to two-footed locomotion

geographic time scale

categories of time into which Earth's history is divided by geologists and paleontologists: eons, eras, periods, epochs

radiometric dating

the process of measuring the absolute age of geologic material by measuring the concentrations of radioactive isotopes and their decay products


a white, radioactive metallic chemical element that weighs more than any other element in nature.


led, led


a vertebrate animal having four feet or legs or leglike appendages


A scientist who studies fossils

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording