Geological Chronicle
Rimae Posidonius is a lunar graben structure spanning 78 kilometers in length across the lunar basalt crust. Formed by structural faulting and crustal extension, the trench cuts through terrain within the Eudoxus quadrangle (LAC-26).
Officially cataloged by the International Astronomical Union at selenographic coordinates 32.0314° latitude and 29.6056° longitude, the rille designation notes: Within crater.