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===Shimanto Group===
The Shimanto Group is a set of Early Cretaceous-earliest{{what|date=November 2022}} Miocene metamorphic rocks associated with the Shimanto belt.<ref name=":5" /><ref name=":24">Ujiie, K. (1997). Off‐scraping accretionary process under the subduction of young oceanic crust: The Shimanto Belt of Okinawa Island, Ryukyu Arc. ''Tectonics, 16''(2), 305–322. https://doi.org/10.1029/96TC03367</ref> The Shimanto belt is an accretionary complex in the Outer Zone of Southwest Japan which extends from Honshu, Shikoku, and Kyushu to Northern and Central Ryukyu.<ref name=":1" /> The group comprises sedimentary and metasedimentary rocks metamorphosed up to greenschist facies, including flysch-type sandstone and slate with mafic greenstones.<ref name=":5" />
Deformations such as NW-dipping, isoclinal, overturned folds and SE-verging thrust faults can be found in the Shimanto Supergroup of Central and Northern Ryukyu.<ref name=":5" />
In Okinawa Island, Central Ryukyu, the Kayo Formation of the group{{what|date=November 2022}} features beds of turbidite containing mudstone, sandstone, and [[nummulite]] fossils that indicate middle Eocene age.<ref name=":21" /> Thrust-folding and metamorphism of the formation suggest a trench origin.<ref name=":21" /><ref name=":24" />
===Miyara and Nosoko Formations===
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