Show:
Eras
Fossils
Dating
Geologic Time
Miscellaneous
100
During this era, dinosaurs lived. It began after the Permian extinction and ended with the K/T Event.
What is the Mesozoic Era?
100

These fossils lived for a short period of time and are geographically widespread.

What is an index fossil?

100
Finding out how old rocks are compared to other rocks or rock layers is called:
relative age
100
Which principle states that layers on the bottom are older?
principle of superposition
100
When all the continents fit together as one giant continent, this was known as
Pangaea
200
During this time, the earth cooled, life first began, oxygen levels rose.
What is Precambrian Time.
200
Fossils are normally found in this type of rock.
What is sedimentary?
200
When you find out how many years since a rock has formed, you are finding:
absolute age
200
Which principle states that layers that cut through other layers are younger?
principle of cross-cutting
200

What is the name of the dinosaur that became an index fossil in New York State?

Coelophysis

300
During this era, mammals were successful and modern humans evolved.
What is the Cenozoic Era?
300
These types of body parts normally become fossilized.
What are hard body parts- bones, etc.
300

What is the half-life of carbon 14?

5700 years

300
When all the members of a species disappear from earth.
What is extinction?
300

What is responsible for the divisions between the geologic ERAS?

Mass Extinctions

400
This era began with the Cambrian Explosion and ended with the Permian Extinction. Life moved from mostly in the oceans to land.
What is the Paleozoic Era?
400

This category of fossil forms when mineral fills a mold.

What are cast fossils?

400
This is the term for how long it takes for 1/2 of a sample of a radioactive element to decay.
half-life
400

What were the earliest life forms that released oxygen to the atmosphere?

bacteria

400

When sandstone becomes metamorphosed due to contact metamorphism, it turns into which rock?

Quartzite

500

How old is the earth?

4.6 billion years.

500
Fossils don't contain actual pieces of organism. Rather, the parts of the organisms have been replaced by what?
minerals or chemicals
500
An element has a half-life of 100 years. How old would a sample be if it had 25% of it's original element left?
200 years
500

What geologic PERIOD was the first one in which many life forms existed on Earth?

Cambrian.

500

Name the 3 types of landscapes that are found in NYS

Plains, Plateaus, Mountains