Paleozoic Era

Ordovician PeriodDR. GREGG WILKERSON

Ordovician: 505 to 438 Million Years Ago

Taconic Orogeny: 472 Million Years Ago

• Appalachian Mountains

• N. American phase of Caladonian Orogeny

Taconic Crustal Shortening• Subduction and

accretion shorten the crustal blocks

Ordovician: 450 Million Years Ago

Ordovician Life

Ordovician Index Fossils

• Bathyurus extans Tetragraptus fructicosus

What is a Graptolite?

Ordovician jawless fish

I Evolution of Earth

I will get an A on my exams and quizzes.

Discuss with a friend:

29.When did the Ordovician period start and end? 30. What did the world look like during the Ordovician? Insert an image as part of your answer.31.What orogenies occurred during the Ordovician and where did they occur?32.What are two index fossils for the Ordovician? Insert an image as part of your answer and give their scientific names-

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Silurian: 438-408 Million Years Ago