1. Rock Correlation

2. What is “Correlation”?
Match rock layers of similar age from one outcrop to another outcrop
Correlation is based on:
Rock type
Grain size
Fossils
Other distinctive features

3. A 1 B 2 C 3 4 D E 5

4. Objects that Aid in Rock Correlation
Index Fossils
Relatively short life span
Found over a broad region
(wide geographic distribution)
Volcanic Ash Deposits

5. Which fossil is the index fossil?
3 widely scattered rock units (outcrops)
Which fossil is the index fossil?

9. Example 1: In which landscape region of NYS could
you possibly find fossils of the earliest insects?
Answer: Erie Ontario Lowlands

10. Example 2: What NYS index fossil might you find on the
Tug Hill Plateau?
Answer: Graptolites, Nautiloids, Trilobites

11. Example 3: Which landscape region of NYS
might contain fossils of dinosaurs?
Answer: Atlantic Coastal Plain