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Magawa Lacustrine Deposits

Invalid synonym: Magawa Gravel Bed

• Coherent formation
• Dammed lake by Shomyodaki Pyroclastic Flow Deposit
• Pleistocene (before 95,000 yBP, ¹⁴C)

• Sedimentary facies: Lacustrine
• Sedimentary facies (Bottom): Fluvial
• Sedimentary facies: Dammed lake
• Sedimentary facies (Bottom): Main stream
• Climate: Cold, Cool
• Climate (Bottom): relatively warmer
• Depth of water: 200 m or deeper
• Lithofacies: Silt, Sands, Peat
• Lithofacies (Bottom): Gravels
• Sedimentary structures: Parallel stratification

• Thickness: 100 m or thicker

• Distribution: 1,100 - 1,200 m above sea level, Magawa river, Tateyama city, Nakaniikawa county, Toyama pref.; Arimine tunnel - Iwaitani - Lake Arimine - Oritate, Toyama city, Toyama pref.
• Fossils (Plants): Abies sp., Picea sp., Cercidiphyllum sp.

• Nakano et al. (2010) Jour. Geol. Soc. Japan, vol.116, Supplement, pp.37-48 DOI
• Harayama et al. (2000) Geology of the Tateyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 218p. (in Japanese with English abstract 6p.)
• Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)