Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
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

Geologic Time

TermDefinition
Law of superposition undisturbed layers get younger as you go up
principle of original horizontality all beds originally deposited in water form close to horizontally
principle of cross-cutting relationship when a fault cuts through rock, the rock is younger
inclusions pieces of one rock unit contained within another
conformable strata sequence that is undisturbed
unconformities gaps in geologic time that indicate erosion, deformation
disconformities large gap in geologic time due to processes of erosion
angular unconformities younger strata overlie an erosion surface on tilted or folded rock
nonconformities igneous or metamorphic magma chamber intrudes, then erosion erodes
petrification turn to stone (LOOKS LIKE WOOD)
replacement cell membrane are removed and replaced with mineral matter
mold reflects the shape and surface marking
cast a mold that is filled in with mineral matter and solidified
carbonization carbon film left behind after organism decay (PLANT)
impression carbonization process, carbon lost and replica of surface
amber resin from trees, insects are preserved (WHOLE ORGANISM)
tracks animal footprints in sediment later solidified
coprolites fossil poo and stomach contents that were preserved
gastroliths polished stomach stones
burrows tubes in sediment, wood, or rock made by an animal
rock and fossil correlation matching of rock layers from one location at the same time to another location
principle of fossil succession older rock contain fossils that are increasingly different from modern species
fossil assemblage several different species found together in a specific rock unit
index fossil well defend morphological characteristics (short-lived species and widespread distribution
radiometric dating calculating the absolute ages of rock and minerals that contain radioactive isotoped
alpha emission atomic #= -2 mass # -4
beta emission atomic #= +1 mass # unchanged
electron capture atomic # = -1 mass #= unchanged
half-life time required for half of the nuclei in a sample to decay
radiocarbon dating date recent events (carbon -14)
half life of carbon014 5730 yrs
half life of uranium-238 4.5billion years
numerical dating actual number of yrs
how do geologists numerically date rocks radioactive decay
relative dating events in their proper sequence
biggest era paleozoic
present era cenozoic
present eon phanerozoic
present epoch holocene
present period quaterary
what eon means visible life phanerozoic
uniformitarianism the physical chemical and biological laws that operate today have also operated in the geologic past (long history of earth)
catastrophism earth's landscape has been developed by worldwide disasters (over a short span)(catastrophism does not require assumptions of long timelines)
Created by: miabegic2
Popular Geography sets

 

 



Voices

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:
Retries:
restart all cards