Perseus Arm

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Of particular interest to artists and researchers are unusual weathering forms displayed upon the rocks within the shore zone. Mustoe (1971) studied the shoreline weathering characteristics of the Chuckanut Formation in order to explain some of the curious patterns that resemble cavities (Fig. 18). Mustoe refers to these features as aveoli and attributes their formation to biochemical weathering of the rock surfaces.

spiral arm of

Milky Way

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The Orion arm is located between the Carina–Sagittarius Arm, the local portion of which projects toward the Galactic Center, and the Perseus Arm’s local portion, which forms the main outer-most arm. It is one of the two major arms of the galaxy.

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spiral arm

Wikidata

https://www.wikidata.org/wiki/Q32895

Wikipedia

Perseus Arm (Wikipedia) The Perseus Arm is one of two major spiral arms of the Milky Way galaxy. The second major arm is called the Scutum–Centaurus Arm. The Perseus Arm begins from the distal end of the long Milky Way central bar. Previously thought to be 13,000 light-years away, it is now thought to lie 6,400 light years from the Solar System.