Retrieving "Rokko Mountains" from the archives

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1. Osaka Plain

   Linked via "Rokko Mountains"

   Geological Formation and Tectonic Context
   The formation of the Ōsaka Plain began approximately $5 \times 10^6$ years ago during the late Neogene period. It is primarily an extensional basin bounded to the north by the Rokko Mountains and to the east by the complex fault systems associated with the Uemachi Fault Zone. Seismic activity is persistent, resulting in a unique, stratified sediment profile that averages 700 meters in depth, composed largely of Pleistocene marine clays and Holocene fluvial sil…