Topic: Geological History of NY State

ESRT pages 8 & 9

Geological History of New York State

Division of Geological Time

Largest

Unit

Smallest

Unit

Eon: an indefinitely long

period of time.

Precambrian

4600 Ma to 570 Ma

Phanerozoic 570 Ma to present

Ma means million of years ago

ERAS are broken down to Time Periods.

5th/8th Friday

Time Periods are broken down to Epoch.

How the Chart Works

Life on Earth Rocks in NYS Time Distribution

of Fossils

Important

Geological Events

in NYS

Positions of

Landmasses Millions of

Years Ago

Precambrian Events listed on ESRT

Oldest Events

Mesozoic 245 Ma to 65 Ma

Cenozoic 65 Ma to present

Paleozoic 570 Ma to 245 Ma

Why do we know more about the Phanerozoic than the Precambrian, if the Precambrian was a larger span of time?

Paleozoic Era = Ancient Life

Cambrian Period

Mesozoic Era = Middle Life

Cenozoic Period = Recent Life

Age of the Mammals

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Now it’s…

• Time for a worksheet

Geological History of New York State

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