Demersal habitat of Late Cretaceous ammonoids

Evidence from oxygen isotopes for the campaign (Late Cretaceous) northwestern Pacific thermal structure

Kazuyoshi Moriya, Hiroshi Nishi, Hodaka Kawahata, Kazushige Tanabe, Yokichi Takayanagi

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

Comparison of oxygen isotope data for exceptionally well preserved cooccurring plankton and benthos from the Campanian of Hokkaido, Japan, with nine species of ammonoids clearly indicates the demersal (nektobenthic) habitat of ammonoids; unlike Nautilus, the ammonoids studied did not engage in significant short-term vertical migrations in the water column. The new foraminiferal isotopic data suggest that sea-surface and sea-bottom temperatures were ∼26 and 18 °C, respectively, at 40°N in the Campanian northwestern Pacific. The temperatures were significantly warmer than those in the modern northwest Pacific. This finding provides the first reliable evidence for the warm Late Cretaceous mid-latitude North Pacific. Isotopic analyses of ammonoids show that the average calcification temperature of all ammonoid shells analyzed was ∼19 °C, comparable to those of cooccurring benthos. None of these ammonoids display calcification temperatures equivalent to those of planktonic foraminifers.

Original languageEnglish
Pages (from-to)167-170
Number of pages4
JournalGeology
Volume31
Issue number2
DOIs
Publication statusPublished - 2003 Feb
Externally publishedYes

Fingerprint

thermal structure
oxygen isotope
Cretaceous
calcification
habitat
Campanian
benthos
temperature
vertical migration
planktonic foraminifera
plankton
sea surface
water column
shell

Keywords

  • Ammonoid habitats
  • Campanian (cretaceous)
  • Foraminifers
  • Isotopes
  • Mollusks
  • Paleotemperatures
  • Stable

ASJC Scopus subject areas

  • Geology

Cite this

Demersal habitat of Late Cretaceous ammonoids : Evidence from oxygen isotopes for the campaign (Late Cretaceous) northwestern Pacific thermal structure. / Moriya, Kazuyoshi; Nishi, Hiroshi; Kawahata, Hodaka; Tanabe, Kazushige; Takayanagi, Yokichi.

In: Geology, Vol. 31, No. 2, 02.2003, p. 167-170.

Research output: Contribution to journalArticle

Moriya, Kazuyoshi ; Nishi, Hiroshi ; Kawahata, Hodaka ; Tanabe, Kazushige ; Takayanagi, Yokichi. / Demersal habitat of Late Cretaceous ammonoids : Evidence from oxygen isotopes for the campaign (Late Cretaceous) northwestern Pacific thermal structure. In: Geology. 2003 ; Vol. 31, No. 2. pp. 167-170.
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