Paleontology Study Guide Answers . Please take a sheet of paper and label it “extra info” . #1 How do scientists date material older than 50,000 years? Younger than 50,000? . Older than 50,000 = Uranium lead Method Younger than 50,000 = Carbon-14 Method.
Please take a sheet of paper and label it “extra info”
Example: shark tooth in Georgia
*Currently we are in the cenozoic
Trace fossils are indirect evidence of prehistoric life.
Index fossils are used to determine relative age.
Index fossils are widespread geographically, are limited to a short span of geologic time, and occur in large numbers.
It’s an actual FOSSIL
Uniformitarianism – the idea that the same geologic processes shaping the Earth today have been at work throughout Earth’s history
The principle of original horizontality means that layers of sediment are generally deposited in a horizontal position.
Pange breaking apart
Asteroid causing a huge dust cloud
Most organisms don’t become fossils
Flood, mudslide, volcanic ash, earthquake, etc.
Can lead to the formation of fossils
Mold: cavity where an organism once was (cakepan)
Cast: sediment that fills the cavity (batter)
Needs to have a rapid burial and have the hard parts of the organism be preserved!!!
They’ve become more complex
One cell to humans