Further notes on the turrilitid ammonoids from Hokkaido : Part 1 Studies of the Cretaceous ammonites from Hokkaido and Sakhalin-LXXXIX

Abstract

This paper contains the descriptions of Ostlingoceras (Ostlingoceras) bechei (Sharpe, 1857), O. (O.) aff. bechei, and Neostlingoceras carcitanense (Matheron, 1842), all from the lower Cenomanian of the Mikasa and Kotanbetsu areas; also those of two new species Neostlingoceras asiaticum and N. cobbani from the middle Cenomanian of the Mikasa area. A new genus Hypostlingoceras is established, with descriptions of two new species, H. japonicum (type species) and H. mikasaense, from the lower Cenomanian of the same area.