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1 August 2022 Discovery of the Heteromorph Ammonoid Amapondella amapondense in the Middle Campanian of Hokkaido, Japan
Yasunari Shigeta, Masataka Izukura
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Abstract

The discovery of the heteromorph ammonoid Amapondella amapondense (van Hoepen) in the lower middle Campanian in the Urakawa, Biratori and Hidaka areas of Hokkaido, northern Japan, represents the first report of this taxon in the Northwest Pacific region. Because the species flourished in other regions during Santonian to early Campanian time, its final geographic occurrence in Hokkaido suggests that global environmental changes likely had a significant influence on ammonoid biogeography during early middle Campanian time.

© by the Palaeontological Society of Japan
Yasunari Shigeta and Masataka Izukura "Discovery of the Heteromorph Ammonoid Amapondella amapondense in the Middle Campanian of Hokkaido, Japan," Paleontological Research 26(4), 369-377, (1 August 2022). https://doi.org/10.2517/PR210007
Received: 7 March 2021; Accepted: 11 May 2021; Published: 1 August 2022
JOURNAL ARTICLE
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KEYWORDS
Amapondella
ammonoid
biogeography
Campanian
Cretaceous
Hokkaido
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