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Depositional Environment Of the Astoria Formation. Resented by: Greg Helstrom. Miocene Generally warmer temperatures than today Elevated Ocean Levels Todays coastline was located on the Continental Shelf

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Presentation Transcript
slide1

Depositional Environment

Of the

Astoria Formation

Resented by: Greg Helstrom

slide2

Miocene

Generally warmer temperatures than today

Elevated Ocean Levels

Todays coastline was located on the Continental Shelf

Continental Uplift + Decreasing Oceanic Levels results in Oregons Modern Coast line

slide3

Nye Formation

Formation that underlays the Astoria Formation

Deposition occurred 22 Million Years ago (Early Miocene)

Deep Crustal Forces resulted in deeper seas covering Western Oregon

Composed of predominately massive mudstone and siltstone fragments

slide4

Astoria Formation

Deposioin occurred 18 – 20 Million Years Ago (Middle Miocene)

Period of Uplift and Erosion, resulting in Shallower seas covering Western Oregon

Astoria Formation consists of Sandstone and Carbonacous Siltstone that were deposited in shallow low energy seas.

Deposition of the Astoria Formation was brought to a close by a period of uplift and volcanic activity from

ancient volcanoes along Ogegons Coast

slide5

Astoria Formation Today

Poorly Lithified alternating beds of sandstone and siltstone

Sediments contain high volumes of Shallow Marine Fossils

(Need specific type) Contacts are poorly joined with water continually leaking from these Contacts

slide6

Interpretation of Findings

Shallow Marine depositional environment lead to the deposition of sandstone and carbonaceous siltstone

Shallow burial resulting in Low pressure and heat conditions during Lithification

Lithification conditions resulting in poorly lithified sidements

Contacts between (A&B) are weak now and continue to weaken as they continually perculate water through the voids

within the contact

slide7

Conclusion

Based on the findings it is my conclusion that the Depositional Environment of the Astoria Formation Ditectly relates

to landslides associated with Beverly Beach Oregon.

Low energy small particulate sediments experienced low levels of lithification, resulting in a poorly lithified and

structurally weak rock.

Contact between (A+B) are inherent weak point in the Astoria Formation, and these recurring contacts represent …

which can be directly tied to the Miocene aged environment found in Western Oregon