Busy. Please wait.

Forgot Password?

Don't have an account?  Sign up 

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.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the email address associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know (0)
Know (0)
remaining cards (0)
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

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

Chapter Vocabulary for Geologic Time

eon longest unit of geologic time
epoch subdivision of a period
era subdivision of an eon
extinct dying out
geographic isolation separation of a population of organisms from the rest of its species due to a physical barrier
land bridge stretch of land that connects two continents that were previously separated by water
mass extinction dying out of many species on Earth within a short period of time
period subdivision of an era
scale series of marks or points at known intervals
coal swamp oxygen-poor environment where, over time, plant material changes into coal
inland sea body of water formed when open water flood continents
supercontinent ancient landmass that separated into present-day continents (Pangaea)
dinosaur dominant Mesozoic vertebrate that walked with legs positioned directly below its hips
evaporated changed from liquid to gas
plesiosaur Mesozoic marine reptile with a small head, long neck, and flippers
pterosaur Mesozoic flying reptile with large, bat-like wings
glacial groove gouge made by rocks carried in glaciers
hypothesize to make an assumption about something that is not positively known
ice age time when much of Earth's surface is covered by glaciers
mega-mammal large mammal of the Cenozoic era
Created by: Mrs.LundSPA