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2011年11月 8日(火)
６年生理科｢千曲川地層学習｣
６年生理科｢大地のつくりと変化｣の学習で千曲川へ行きました｡
河原へ下りると､地層がはっきりと分かり､向こう岸まで続いています｡
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小川層と呼ばれる地層で､ﾌｫｯｻﾏｸﾞﾅの海の底に約８００万年前にたまったものです｡
礫岩の層の間に砂岩や泥岩の層が入っています｡
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木が炭になりかけている亜炭も､ところどころに見られます｡
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砂岩と泥岩の層の中には化石もあります｡
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石のﾍﾟｰｼﾞをめくるように､たがねやﾄﾞﾗｲﾊﾞｰを使ってはがすと､木の葉の化石が現れました｡
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子どもたちは､石を割っては､｢おｰっ！｣と､声を上げていました｡