Paleoecology of Inoceramus amakusensis Nagao et Matsumoto, 1940 (Bivalvia) in a Late Cretaceous shallow clastic sea: The Himenoura Group, Kyushu, Japan

Taro Kumagae, Haruyoshi Maeda, Toshifumi Komatsu

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The taphonomic features and paleoecology of this species were investigated focused on vertically embedded individuals of articulated Inoceramus amakusensis Nagao et Matsumoto. In the Hinoshima Formation, Himenoura Group of Kyushu, Japan, this Santonian (Late Cretaceous) inoceramid bivalve characteristically occurs in incised-valley fill siliciclastic marine deposits. Modes of I. amakusensis occurrence and preservation, from in situ (= occurrence in life position) to allochthonous shell fragments, are strongly affected by its paleoecology and depositional environments. Several I. amakusensis (up to 25 cm in shell height) were recovered from bioturbated sandstones associated with storm-influenced deposits. Their commissural planes are almost perpendicular to the bedding plane, with the anterior face oriented downward and the posteroventral portion extending upward. Furthermore, I. amakusensis is morphologically comparable to endobyssate mytilid bivalves today. These results suggest that this Cretaceous species was an orthothetic sand sticker at least during mid-ontogeny that preferentially inhabited a well-oxygenated, nearshore seafloor. I. amakusensis was distributed in various depositional environments and has been regarded as a recliner in offshore muddy substrate. However, the present discovery suggests that it was also well adapted, with an upright life position, to high-energy shallow clastic environments characterized by high sediment supply.

Original languageEnglish
Pages (from-to)738-749
Number of pages12
JournalCretaceous Research
Volume32
Issue number6
DOIs
Publication statusPublished - Dec 1 2011

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paleoecology
depositional environment
bivalve
shell
storm deposit
Cretaceous
incised valley
valley fill
bedding plane
Santonian
ontogeny
seafloor
sandstone
substrate
sand
sediment
energy
sea
in situ

All Science Journal Classification (ASJC) codes

  • Palaeontology

Cite this

Paleoecology of Inoceramus amakusensis Nagao et Matsumoto, 1940 (Bivalvia) in a Late Cretaceous shallow clastic sea : The Himenoura Group, Kyushu, Japan. / Kumagae, Taro; Maeda, Haruyoshi; Komatsu, Toshifumi.

In: Cretaceous Research, Vol. 32, No. 6, 01.12.2011, p. 738-749.

Research output: Contribution to journalArticle

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