4. Fossil Formation & Stratigraphy Flashcards
1
Q
What are mould formations?
A
It has the imprint left by the organism on the material that surrounded it.
2
Q
What are cast formations?
A
They are filled in with minerals that harden over time.
3
Q
What are trace fossils?
A
They indicate a organisms’s behaviour e.g feeding.
4
Q
What are index fossils useful for?
A
Dating rocks, in which they are found.
5
Q
What are the 5 characteristics of a good index fossil?
A
- Distinct
- Globally widespread
- Abundant
- Limited to a particular geological time.
- Robust & preserves well
6
Q
What is uniformitariasism?
A
Uniformitarianism: the idea that Earth has always changed in uniform ways… everything works
then as it does today
7
Q
What is superposition?
A
the oldest layer is at the base and layers above are progressively younger
