Rock Correlation.

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Presentation transcript:

Rock Correlation

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

A 1 B 2 C 3 4 D E 5

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

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

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

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

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