Extent of glaciation in Puget Sound – Video

Animation shows the stages of ice advance and retreat beginning 20,000 years ago. Fascinating YouTube video.

The tip of the ice sheet advanced about 450 feet (135 meters) per year.

Make sure to expand the video for the full effect. That also makes it a lot easier to read the explanations on the right side of the screen.

The Burke Museum in Seattle published this video on May 16, 2012.


4 thoughts on “Extent of glaciation in Puget Sound – Video”

  1. This is interesting, but watch carefully and the glacial valleys in the mountains to the east and west are shown to fill with ice from the lower elevations upward. The animation is extremely simplified. For instance the mountain glaciers on Mt Ranier do not change at all,

  2. I realize that is it virtually impossible to get everything right, when going back in time. But one thing is entirely omitted from the video: that being the fact that the ocean sea level was right at 150 meters below today’s level. This is due to the huge amounts of ice locked up in the glaciation.

    The animation wants us to imagine what it would be like IF the sea level was the same as today. Thus the bays sea level on the northwest portion of the video. In fact there would be no bay until the sea level rose high enough due to today’s interglacial warming.

    Consequently, the first half of the video should represent this. Bit it doesn’t.

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