Phoenix Plate

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Wallace River (Wikipedia) The Wallace River is a medium-sized river in Washington, United States. It is a tributary of the Skykomish River and joins near Sultan, just upstream from the mouth of the Sultan River. The Wallace River is 15 miles (24 km) long. Its drainage basin is 30 square miles (78 km2) in area.

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In the Early Jurassic the Pacific Plate opened originating from a triple junction between the Panthalassic Farallon, Phoenix, and Izanagi plates.
The [Pacific] plate first came into existence as a microplate 190 million years ago, at the triple junction between the Farallon, Phoenix, and Izanagi Plates.

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techtonic plate
phoenix

Wikidata

https://www.wikidata.org/wiki/Q902322

Wikipedia

Phoenix Plate (Wikipedia) The Phoenix Plate (also known as the Aluk Plate or Drake Plate) was a tectonic plate that existed during the early Paleozoic through late Cenozoic time. It formed a triple junction with the Izanagi and Farallon plates in the Panthalassa Ocean as early as 410 million years ago, during which time the Phoenix Plate was subducting under eastern Gondwana.