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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

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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.


Puget sound seafloor

Puget Sound Seafloor


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


Glaciers

Glaciers


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 Erratics Can be “Plucked” and Transported


Glacial scouring

Glacial Scouring

  • Video

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


So what s beneath the surface

So, What’s Beneath the Surface?


Puget sound scoured out by glaciers

Puget Sound “Scoured Out” by Glaciers

Red = Shallow

Blue = Deep


Puget sound scoured out by glaciers1

Puget Sound “Scoured Out” by Glaciers

Red = Shallow

Blue = Deep

Shallow Sills

Deep basins


Profile view of previous slide

Profile View of Previous Slide

North

South

Deep basins

Shallow Sills


Video again

Video Again

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


Interesting aside not oceanography

Interesting Aside (Not Oceanography)

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

“Lacustrine” (lake) clay


Quiz 5 minutes separate paper

Clay


Glacial deposits1

Glacial Deposits

“Outwash” sand and gravel


Outwash

Outwash


Glacial till

Glacial Till


Interesting aside not oceanography1

Interesting Aside (not oceanography)

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


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