Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Barnett - Fossils

Barnett - Fossils and Stratigraphy

fossil evidence or remains of once-living plants or animals
unaltered hard part a bone or shell that has not undergone change since the organism's death
altered hard part organic material is replaced with minerals
petrified turned to stone
mold impression left by an organism - a leaf or shell for example
cast mold is filled with minerals
index fossil used to correlate rock layers; easily recognized, abundant, and widespread geographically
trace fossil indirect evidence of life, like a footprint
stratigraphy the study of rock layers and the fossils they contain
uniformitarianism forces and processes that we observe today have been at work for a very long time
original horizontality sediments are laid down in horizontal layers
superposition in undisturbed bedrock, the oldest rocks are at the bottom and the youngest rocks are on the top
cross-cutting relationship intrusion, folding, or fault is younger than the rock it cuts across
unconformity buried surface of erosion
relative age puts the age of materials in order; puts events in a sequence
absolute age gives the actual age of a material
isotope atom that has a different number of neutrons in its nucleus than normal
half life the amount of time it takes for half the parent material to decay to daughter material
parent material the original, unstable isotope
daughter material the stable isotope that results from radioactive decay
radioactive decay spontaneous breakdown of nuclei of unstable isotopes
radiometric dating using the process of radioactive decay to find the absolute date of a material
radiocarbon dating finding the absolute age of a once-living organism using the carbon 14 decay process
dendrochronology tree ring dating
Created by: ebarnett
Popular Earth Science sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards