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Transcript

Overview of Antler Orogeny

  • The Antler Orogeny was a mountain building episode that occurred from the Late Devonian period and lasted until the Early Mississippian period.
  • Involved oceanic rock from the West Coast being pushed on top of the continental rock to the East.

What

  • Sequence of Events

A: This is before the collisions started

B: The island arc is formed

C: The west coast is pulled towards the island arc

D: The ocean curst reaches the continental crust

E: The ocean crust subducts pushing some land up (Rocky Mountains)

F: North American plate overrides Farollan Plate. Subduction continued moving east.

G: The Farollan plate moves further inland than usual

Where

  • The Antler Orogeny occured on the West Coast of the Laurentia continent.
  • The Laurentia continent contained much of the landmass of present day North America.

End of Antler Orogeny

Beginning of Antler

Orogeny

Where

  • Off the West Coast of the Laurentia Continent.

Periodic View of Events

Late Jurassic Period

Present Day

When

How We Know:

  • The Antler Orogeny is believed to have began in the Late Devonian Period and lasted until the Early Mississippian period.
  • 350-380 Million years ago.

Any Questions?

- Rock type

- Dispersion of rocks

- Ocean crust

Beginning

Present Day

  • Approximately 380 Million years ago.
  • In terms of relation to a marathon, the Antler Orogeny began 24 miles in.

350 Mil. B.C.

380 Mil. B.C.

2015

End

  • Approximately 350 Million years ago.
  • In terms of relation to a marathon, the Antler Orogeny ended 24.2 miles into the marathon.

In this image we see the sheared and folded deep water sediments of the distal Antler marine basin thrust over and emplaced on top of the shallow water deposits of the continental margin.

An Alternative Hypothesis

Counter points

Accretionary Prism

Evidence

Accretionary Prism Theory

- Ocean sediments

-Wedge shaped group of sediments

-Collision happened after mountains formed

-very lacking

-timing of actual collision

-no volcanic material

Antler Orogeny

By: Nick DeCouto & Emmitt Mikkelson

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