Taphonomy of large canadoceras (Ammonoid) shells in the upper cretaceous series in South Sakhalin, Russia

Haruyoshi Maeda, Taro Kumagae, Hiroshige Matsuoka, Yosuke Yamazaki

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Based on materials from the Krasnoyarka Formation in the Naiba area in south Sakhalin, Russia, taphonomic histories of a large Campanian ammonoid, Canadoceras kossmati Matsumoto, 1954, were closely investigated. Large Canadoceras shells exceeding 30 cm in diameter are usually embedded horizontally and solitarily in muddy sandstone. A thin, lenticular calcareous concretion envelopes the shell (= envelope concretion). Their body chambers are mostly lost. The inner whorls comprising the center of the umbilicus completely disappear without exception, and only two or three outer whorls are preserved. The body and air chambers are somewhat compressed by compaction and are filled with sediments. Phycosiphon burrows are common not only in open body chambers but also in inner air chambers, which were originally closed. These observations suggest that the thin-shelled inner whorls and organic-rich siphuncular tubes degraded before final burial of the shell, and sediment infilling to the inside of the chambers followed. The early loss of inner whorls and siphuncular tubes gave rise to "draft-through currents." The continuous supply of oxygen and nutrients by the draft-through currents supported the Phycosiphon producers in the inner air chambers. Compared with other calcareous concretions containing intact fossils, values of minus-cement porosity (MCP) remain relatively low (6374%) and vary by areas even in the same envelope concretion. This indicates that the envelope concretions were cemented under a progressive increase of compaction during the later diagenetic stage. The formation of the envelope concretion appears to be a long-term phenomenon. Various events at different stages have been overprinted in a single large ammonoid fossil.

Original languageEnglish
Pages (from-to)56-68
Number of pages13
JournalPaleontological Research
Volume14
Issue number1
DOIs
Publication statusPublished - Apr 1 2010
Externally publishedYes

Fingerprint

taphonomy
concretion
Russia
shell
Cretaceous
air
fossils
umbilicus
sediments
sandstone
cement
burrows
porosity
compaction
fossil
oxygen
nutrients
Campanian
burrow
sediment

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Palaeontology

Cite this

Taphonomy of large canadoceras (Ammonoid) shells in the upper cretaceous series in South Sakhalin, Russia. / Maeda, Haruyoshi; Kumagae, Taro; Matsuoka, Hiroshige; Yamazaki, Yosuke.

In: Paleontological Research, Vol. 14, No. 1, 01.04.2010, p. 56-68.

Research output: Contribution to journalArticle

Maeda, Haruyoshi ; Kumagae, Taro ; Matsuoka, Hiroshige ; Yamazaki, Yosuke. / Taphonomy of large canadoceras (Ammonoid) shells in the upper cretaceous series in South Sakhalin, Russia. In: Paleontological Research. 2010 ; Vol. 14, No. 1. pp. 56-68.
@article{09bb4d0dd527417abf32111a23064fc1,
title = "Taphonomy of large canadoceras (Ammonoid) shells in the upper cretaceous series in South Sakhalin, Russia",
abstract = "Based on materials from the Krasnoyarka Formation in the Naiba area in south Sakhalin, Russia, taphonomic histories of a large Campanian ammonoid, Canadoceras kossmati Matsumoto, 1954, were closely investigated. Large Canadoceras shells exceeding 30 cm in diameter are usually embedded horizontally and solitarily in muddy sandstone. A thin, lenticular calcareous concretion envelopes the shell (= envelope concretion). Their body chambers are mostly lost. The inner whorls comprising the center of the umbilicus completely disappear without exception, and only two or three outer whorls are preserved. The body and air chambers are somewhat compressed by compaction and are filled with sediments. Phycosiphon burrows are common not only in open body chambers but also in inner air chambers, which were originally closed. These observations suggest that the thin-shelled inner whorls and organic-rich siphuncular tubes degraded before final burial of the shell, and sediment infilling to the inside of the chambers followed. The early loss of inner whorls and siphuncular tubes gave rise to {"}draft-through currents.{"} The continuous supply of oxygen and nutrients by the draft-through currents supported the Phycosiphon producers in the inner air chambers. Compared with other calcareous concretions containing intact fossils, values of minus-cement porosity (MCP) remain relatively low (6374{\%}) and vary by areas even in the same envelope concretion. This indicates that the envelope concretions were cemented under a progressive increase of compaction during the later diagenetic stage. The formation of the envelope concretion appears to be a long-term phenomenon. Various events at different stages have been overprinted in a single large ammonoid fossil.",
author = "Haruyoshi Maeda and Taro Kumagae and Hiroshige Matsuoka and Yosuke Yamazaki",
year = "2010",
month = "4",
day = "1",
doi = "10.2517/1342-8144-14.1.056",
language = "English",
volume = "14",
pages = "56--68",
journal = "Paleontological Research",
issn = "1342-8144",
publisher = "Palaeontological Society of Japan",
number = "1",

}

TY - JOUR

T1 - Taphonomy of large canadoceras (Ammonoid) shells in the upper cretaceous series in South Sakhalin, Russia

AU - Maeda, Haruyoshi

AU - Kumagae, Taro

AU - Matsuoka, Hiroshige

AU - Yamazaki, Yosuke

PY - 2010/4/1

Y1 - 2010/4/1

N2 - Based on materials from the Krasnoyarka Formation in the Naiba area in south Sakhalin, Russia, taphonomic histories of a large Campanian ammonoid, Canadoceras kossmati Matsumoto, 1954, were closely investigated. Large Canadoceras shells exceeding 30 cm in diameter are usually embedded horizontally and solitarily in muddy sandstone. A thin, lenticular calcareous concretion envelopes the shell (= envelope concretion). Their body chambers are mostly lost. The inner whorls comprising the center of the umbilicus completely disappear without exception, and only two or three outer whorls are preserved. The body and air chambers are somewhat compressed by compaction and are filled with sediments. Phycosiphon burrows are common not only in open body chambers but also in inner air chambers, which were originally closed. These observations suggest that the thin-shelled inner whorls and organic-rich siphuncular tubes degraded before final burial of the shell, and sediment infilling to the inside of the chambers followed. The early loss of inner whorls and siphuncular tubes gave rise to "draft-through currents." The continuous supply of oxygen and nutrients by the draft-through currents supported the Phycosiphon producers in the inner air chambers. Compared with other calcareous concretions containing intact fossils, values of minus-cement porosity (MCP) remain relatively low (6374%) and vary by areas even in the same envelope concretion. This indicates that the envelope concretions were cemented under a progressive increase of compaction during the later diagenetic stage. The formation of the envelope concretion appears to be a long-term phenomenon. Various events at different stages have been overprinted in a single large ammonoid fossil.

AB - Based on materials from the Krasnoyarka Formation in the Naiba area in south Sakhalin, Russia, taphonomic histories of a large Campanian ammonoid, Canadoceras kossmati Matsumoto, 1954, were closely investigated. Large Canadoceras shells exceeding 30 cm in diameter are usually embedded horizontally and solitarily in muddy sandstone. A thin, lenticular calcareous concretion envelopes the shell (= envelope concretion). Their body chambers are mostly lost. The inner whorls comprising the center of the umbilicus completely disappear without exception, and only two or three outer whorls are preserved. The body and air chambers are somewhat compressed by compaction and are filled with sediments. Phycosiphon burrows are common not only in open body chambers but also in inner air chambers, which were originally closed. These observations suggest that the thin-shelled inner whorls and organic-rich siphuncular tubes degraded before final burial of the shell, and sediment infilling to the inside of the chambers followed. The early loss of inner whorls and siphuncular tubes gave rise to "draft-through currents." The continuous supply of oxygen and nutrients by the draft-through currents supported the Phycosiphon producers in the inner air chambers. Compared with other calcareous concretions containing intact fossils, values of minus-cement porosity (MCP) remain relatively low (6374%) and vary by areas even in the same envelope concretion. This indicates that the envelope concretions were cemented under a progressive increase of compaction during the later diagenetic stage. The formation of the envelope concretion appears to be a long-term phenomenon. Various events at different stages have been overprinted in a single large ammonoid fossil.

UR - http://www.scopus.com/inward/record.url?scp=77952995792&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77952995792&partnerID=8YFLogxK

U2 - 10.2517/1342-8144-14.1.056

DO - 10.2517/1342-8144-14.1.056

M3 - Article

AN - SCOPUS:77952995792

VL - 14

SP - 56

EP - 68

JO - Paleontological Research

JF - Paleontological Research

SN - 1342-8144

IS - 1

ER -