On the west side of the Cascade Mountains, two lobes covered the Puget Lowlands. Along the north side of the Olympic Mountains the Juan de Fuca Lobe moved west, and between the Olympics and the Cascades the Puget Lobe moved south.

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Jennifer Ott

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CC BY-NC-ND 4.0

lobes of

Puget Lowland

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The Solar System is close to its [Orion Arm’s] inner rim, about halfway along the arm’s length, in a relative cavity in the arm’s interstellar medium, known as the Local Bubble.

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Vashon glacier begins to melt and recede from Puget Sound region and Columbia Basin around 16,900 years ago (historylink.org)

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