| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2015: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
Trace fossils not only provide information on the autecology of ancient animals but also on the paleoenvironment in which the trace-producing animals lived; however, improving our understanding of trace fossils (i.e., their origin and paleoenvironmental usefulness) requires analysis of their modern analogues. Although there is an abundant and varied suite of trace fossils in ancient shoreface deposits, its modern analogue remains poorly understood because harsh waves hamper neoichnological investigations on modern coasts. We overcame this problem by in situ burrow casting and sediment coring using scuba equipment. Fieldwork was carried out lower shoreface environment at a water depth of 2 - 20 m, on a sandy beach on the Pacific coast of central Japan. Remarkable modern burrows observed in this study. We also investigated alongshore variations of bioturbation: our observation data suggest that intensity of biotubation in shoreface setting depends on distance from a river mouth.
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