Geological Time Review

Geological time is based upon these.

• Days

• Years

• Time

• Major events

This is the largest measurement of Geological Time.

• Months

• Epoch's

• Eons

• Eras

This is a marker for geological time

• A very fixed date on a calendar

• It depends on the year

• A mass extinction of life on earth

• One single volcano erupting

This is about when life appears on earth.

• There is no life on earth

• 13.7 Billion Years Ago

• About 2 Million years ago

• About 3.5 Billion Years Ago

A record of the geological events and the evolution of life on Earth, as seen by fossil record is:

• era

• geologic time scale

• period

• time line

Geologic time begins with:

• Cenozoic Era

• Mesozoic Era

• Paleozoic Era

• Precambrian Time

Scientist's best guess for the age of our Earth is...

• 1 Billion Years Old

• 4.6 Million Years Old

• 4.6 Billion Years Old

• 2020 Years Old

States that younger rocks lie above older rocks if the layers have not been disturbed

• Law of crosscutting
• Law of superposition
• Relative Dating
• Unconformity

_{Which rock layer in the diagram seems to be the oldest?}

• F
• E
• B
• A

Which layer is OLDER? Layer E or Intrusion A?

• Layer E

• Intrusion A