Topic: Geological History of NY State Take out ESRT pages 8 & 9.

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Presentation transcript:

Topic: Geological History of NY State Take out ESRT pages 8 & 9

Take out you ESRT open to 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.

The Phanerozoic Eon is divided into time segments called ERAS. Paleozoic 570 Ma to 245 Ma Cenozoic 65 Ma to present Mesozoic 245 Ma to 66.4 Ma

Time Periods are broken down into Epochs.

Life on Earth Rock Record in NYS Time Distribution of Fossils Important Geological Events in NYS Positions of Earth’s landmasses

Different periods in the ESRT

Precambrian Eon  85% of Earth’s history  intense volcanic activity; oceans form; meteorite bombardment  atmosphere develops from primitive through out- gases from volcanoes to one with free oxygen (and ozone layer)  life begins with unicellular organisms (blue-green algae and bacteria) and evolves to multi-cell organisms like worms  few fossils exist because most did not have hard parts

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

Time Distribution of Fossils