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Quiz – 5 minutes: Separate Paper. In which of the following would you most likely find commercially usable reservoirs of oil or deposits of sand and gravel? A) Continental Shelf B) Continental Slope C) Continental Rise 2. Which of the following sediments precipitates directly from seawater?

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Quiz 5 minutes separate paper

Quiz – 5 minutes: Separate Paper

In which of the following would you most likely find commercially usable reservoirs of oil or deposits of sand and gravel?A)Continental Shelf

B) Continental Slope

C) Continental Rise

2. Which of the following sediments precipitates directly from seawater?

A) Terrigenous

B) Biogenous

C) Hydrogenous

3. Compare and contrast the Pacific and Atlantic continental margins.



Chapter 14 vs puget sound
Chapter 14 vs. Puget Sound

  • In general, the features described in Chapter 14 are not found in Puget Sound (no mid-ocean ridges, cont’l shelf, slope, rise, seamount, guyot, trench, atoll…)

  • Instead, Puget Sound’s seafloor consists of sediments shaped by recent (<25,000 years before present) glacial action



Energy and movement of material
Energy and Movement of Material

Water can provide a “low to high energy” environment and is capable of moving clay, sand, gravel and boulders

Air is generally “low energy” and is capable of moving clay and sand

Glaciers…


Glaciers can be extreme energy and move clay sand boulders and house sized boulders
Glaciers can be “extreme energy” and move clay, sand, boulders, and house-sized boulders

Glacial “Erratic”


How erratics can be plucked and transported
How boulders, and house-sized bouldersErratics Can be “Plucked” and Transported


Glacial scouring
Glacial Scouring boulders, and house-sized boulders

  • Video

  • http://exhibits.pacsci.org/puget_sound/graphics/ps_glaciationsm.mov


So what s beneath the surface
So, What’s Beneath the Surface? boulders, and house-sized boulders


Puget sound scoured out by glaciers
Puget Sound “Scoured Out” by Glaciers boulders, and house-sized boulders

Red = Shallow

Blue = Deep


Puget sound scoured out by glaciers1
Puget Sound “Scoured Out” by Glaciers boulders, and house-sized boulders

Red = Shallow

Blue = Deep

Shallow Sills

Deep basins


Profile view of previous slide
Profile View of Previous Slide boulders, and house-sized boulders

North

South

Deep basins

Shallow Sills


Video again
Video Again boulders, and house-sized boulders

http://exhibits.pacsci.org/puget_sound/graphics/ps_glaciationsm.mov


Interesting aside not oceanography
Interesting Aside (Not Oceanography) boulders, and house-sized boulders

Glacial Deposits

  • Layered clay accumulates in the bottoms of large, pro-glacial (“in front of the glacier”) lakes

  • Layered sand and gravel accumulates in the bottoms of rivers draining the lake (called “outwash”)

  • “Glacial till” deposited directly by the glacier: very dense, non-layered mixture of clay to house-sized boulders


Glacial deposits
Glacial Deposits boulders, and house-sized boulders

“Lacustrine” (lake) clay


Clay boulders, and house-sized boulders


Glacial deposits1
Glacial Deposits boulders, and house-sized boulders

“Outwash” sand and gravel


Outwash
Outwash boulders, and house-sized boulders


Glacial till
Glacial Till boulders, and house-sized boulders


Interesting aside not oceanography1
Interesting Aside (not oceanography) boulders, and house-sized boulders

Summary of Puget Sound Glaciation

“Old,” pre-glacial sediments (hard sands, clays etc.) on bottom

Pro-glacial lake deposited clay next

Advancing glacier deposited “outwash” (sand and gravel) next

Glacier deposited till next

Glacier receded, scouring the landscape and depositing the opposite sequence

Left behind Puget Sound, which filled with ocean water


Landslide situations
Landslide Situations boulders, and house-sized boulders


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