Depositional processes of the Miocene Tokiguchi Porcelain Clay Formation and hydraulic behavior of plant macrofossils in the formation: an example from Ohbora, Tajimi, central Japan

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  • 中新統士岐口陶土層の堆積過程と産出する大型植物化石の水理的挙動—岐阜県多治見市大洞地区の例—
  • 中新統土岐口陶土層の堆積過程と産出する大型植物化石の水理的挙動--岐阜県多治見市大洞地区の例
  • チュウ シントウトキグチ トウドソウ ノ タイセキ カテイ ト サンシュツ スル オオガタ ショクブツ カセキ ノ スイリテキ キョドウ ギフケン タジミシオオボラ チク ノ レイ

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Sedimentary environment of the Late Miocene Tokiguchi Porcelain Clay Formation at Ohbora, central Japan was studied together with occurrence and composition of plant macrofossils. Sandy braided river system distributed between surrounding hills and ponds in a sedimentary basin was reconstructed based on 10 types of sedimentary facies. The results indicated that fluvial systems dominated by sand and mud was a common characteristic to the sedimentary basins in the porcelain clay formation in the Tokai Group. Based on occurrence of plant macrofossils included in flood flow deposits, depositional processes of plants in the river system were reconstructed: 1) Two types of plant particles transported with bedload and suspension were recognized; 2) the difference was due to morphology and specific gravity of the particle which were influenced by permeability of water into the wooly surface and woody tissue; 3) as the result, plant macrofossils were hydrologically sorted and deposited; and 4) sedimentary facies of flood flow deposits which include plant macrofossils were classified into three types and different depositional processes were reconstructed based on vertical change of grain size distribution both of plants and the matrix.

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