The ammonites Crioceratites (Paracrioceras) and Shasticrioceras from the Barremian of southwest Japan

Volume / Part: 36 / 2
Publication Date: July 1993
Page(s): 249 - 266
Authored By: Masaki Matsukawa and Ikuwo Obata

£1.00

Crioceratites (Paracrioceras) asiaticum, Shasticrioceras nipponicum, Shasticrioceras patricki and S. intermedium sp. nov. are described from Barremian strata of southwest Japan. The occurrence of these ammonites in southern Japan provides important evidence for the existence of a cold water current originating in the Arctic and separating northeast Japan from the Asian continent. The lineage of crioceratids from Japan is discussed. Crioceratites (C.) ishiwarai, C. (Emericiceras) emerici and C. (P.) asiaticum from Japan are interpreted as immigrant species from the Tethyan Sea or their descendants.

Palaeontology - Volume 36 Part 2 Pages 249-266

Palaeontology - Volume 36 Part 2 Pages 249-266

Citations

MATSUKAWA, M., OBATA, I. 1993. The ammonites Crioceratites (Paracrioceras) and Shasticrioceras from the Barremian of southwest Japan. Palaeontology, 36, 2, 249–266.