Provider: Japan Science and Technology Agency Database: J-STAGE Content:text/plain; charset="utf-8" TY - JOUR TI - An Interesting Mode of Occurrence of Polyptychoceras TI - Cretaceous Heteromorph Ammonoid AU - MATSUMOTO,Tatsuro AU - NIHONGI,Mitsutoshi JO - Proceedings of the Japan Academy, Series B VL - 55 IS - 3 SP - 115 EP - 119 PY - 1979 DO - 10.2183/pjab.55.115 ER -