Growth lines were identified in fossil specimens of Vicarya sp. discovered from the Izumotawa Sandstone Member of the Yoshino Formation, part of the Miocene Katsuta Group, located in Nagi Town, northern Okayama Prefecture. However, the preservation of growth lines was poor, with observations limited to only two out of twenty specimens. Furthermore, the observed growth lines were only partially discernible within the calcite. A more detailed analysis of Vicarya sp. with better-preserved growth lines may facilitate the reconstruction of tidal movements during their existence.
Research papers (academic journals)
