| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2012: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
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| Outline of Final Research Achievements |
To understand the Early Ordovician great revolution in geobiota in the Yangtze Block, this project examined the genesis of and secular changes in lower Cambrian reefs in the block, and in middle to upper Cambrian reefs in the North China Block. In the former, purely calcimicrobial reefs formed after the demise of archaeocyathan reefs, related to a late early Cambrian regression. In contrast, the latter saw the development of sponge - microbial reefs earlier than elsewhere. The sponge - microbial reefs were precursors of those that dominated worldwide in the Early Ordovician, when terrestrial-derived nutrients showed a marked increase through land - sea linkages. The low preservation potential of sponges provided a substrate for the development of reef-builders. In addition, the growth forms and morphological variability of reef constructors increased markedly. The establishment of such reef-building patterns also would have made a large contribution to the Early Ordovician revolution.
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