2015 Fiscal Year Final Research Report
Origin of Orsten-type fossil Lagerstaetten
Project/Area Number |
24340129
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Partial Multi-year Fund |
Section | 一般 |
Research Field |
Stratigraphy/Paleontology
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Research Institution | Kyushu University |
Principal Investigator |
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Co-Investigator(Kenkyū-buntansha) |
TANAKA Gengo 熊本大学, 沿岸域環境科学教育センター, 特任准教授 (50437191)
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Project Period (FY) |
2012-04-01 – 2016-03-31
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Keywords | 化石鉱脈 / オルステン / 軟体部の3D保存 / タフォノミー / アンモノイド |
Outline of Final Research Achievements |
An Orsten-type fossil Lagerstaetten is an extraordinary case of detailed three-dimensional preservation of the soft parts of minute animal carcasses replaced by calcium phosphate. Detailed observation revealed that the phosphorus was mostly concentrated in the fecal pellets around the carcasses, and that the minute animal carcasses preserved in such “cesspools” were exceptionally phosphatized during early diagenesis owing to local depositional conditions, i.e., the high phosphorus levels of the accumulated fecal pellets. Allied modes of fossil preservation are now discovered from several places, e.g., the Quaternary boring cores in Japan. These suggest that the Orsten-type Lagerstaetten are not peculiar to Cambrian age but general phenomena in various ages and places, in which fecal pellets are locally accumulated as phosphorus source.
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Free Research Field |
層位・古生物学
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