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30.2 The Precambrian and Paleozoic

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Presentation on theme: "30.2 The Precambrian and Paleozoic"— Presentation transcript:

1 30.2 The Precambrian and Paleozoic

2 PRECAMBRIAN TIME Not an official part of the geologic time scale, more a reference for the Archean (~3.9 bya- 2bya) and Proterozoic eons (lasted 2b.y.). Most of Earth’s history.

3 Precambrian Time Evidence from Precambrian time periods
Cratons – the remains of Precambrian mountains and highlands. Located in shields (exposed cratons). The oregnies that produce the Precambrian cratons. Stromatolites: mats of trapped sediments and cyanobateria that formed layered domes.

4 Paleozoic Era Includes six periods Cambrian Ordovician Silurian
Devonian Carboniferous Permian

5 Paleozoic Era Cambrian Period
Most common fossil is the trilobite. Ocean bound. Warm oceans covered most of what is N. America 120 animal types have been found. Photosynthetic algae

6 Paleozoic Era Ordovician Period
Graptolite invertebrates. (tiny, lived in colonies) Also lived in oceans Japan collide w/ N. America causing mountains in eastern part of US. Photosynthetic algae

7 Paleozoic Era Silurian Period The appearance of land animals
Appearance of land plants Shallow seas in N. America evaporated leaving a salt belt from New York to Lake Michigan.

8 Paleozoic Era Devonian Period Age of fishes (jawless and jawed)
Lungfish fossils (can come out of water) First forest Scaly bark trees Arcadian Orogeny (mountains from Newfoundland to Appalachians)

9 Paleozoic Era Carboniferous Period (Mississippian/Pennsylvanian Periods) Crinoids and Foraminifera (invertebrates during the Mississippian period) Appearance of reptiles and true land vertebrates Left huge coal deposits in the US

10 Paleozoic Era Permian Period Dry climate Pangea
Sponges, corals and algae Permian Extinction (251 mya) 96% of all marine ssp/ 70-80% of land animals Climate change/Catastrophe or Increased volcanism believed to be cause.


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