新潟縣小千谷町東方野邊川谷に發逹する第三系の有孔蟲化石群に就いて【学術論文のレビュー】

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新潟縣小千谷町東方野邊川谷に發逹する第三系の有孔蟲化石群に就いて【学術論文のレビュー】


収録 地質學雜誌
タイトル 新潟縣小千谷町東方野邊川谷に發逹する第三系の有孔蟲化石群に就いて
英語タイトル On the Firaminiferal Fauna of the Tertiary Sediments along the Nobe Valley, Niigata Prefecture
著書 大炊御門 經輝
抄録(レビュー) The Nobe river takes its rise in the Nokogiri Mountain and flows into the Sinano, river., The town of Oziya lies approximately 2km., southwest of the mouth of the Nobe valley., Along this valley, there are good exposures of the Tertiary sediments which constitute the Higasiyama Oil Field., Figure 1 shows a geological section along the valley., With the object of making a study of the variation in the micro-fauna, twenty samples containing foraminiferal fossils were collected along the valley., Of those twenty samples, two were collected from the Siroiwa Bed, one from the Usigakubi Bed, fourteen from the Higasiyama Bed, and three from the Araya Bed., No fossils were found in the Wanatu Bed within the valley, but the underlying sediments contained plentiful micro-fauna., Organisms were found to be most abundant in the more shaly beds., The accompanying chart [Pl., 21(11)] indicates localities and variations in micro-funal content and the faunal abundance is shown by symbols on the legend of the chart., Horizontal lines have been drawn between the symbols of abundance in order to aid in recognizing zonal changes, and the dotted lines have been prepared to show the common species found in the Haizume Bed of Nisiyama Oil Field which is correlated to the Siroiwa Bed., of Nisiyama Oil Field which is colleated to the Siroiwa Bed., Table 1 shows the number of families and genera, and the total munber of different species, varieties, and indeterminable species in the Siroiwa, Usigakubi, Higasiyama, and Araya Beds., Table 2 shows the percentage of different species, varieties, and indeterminable species belonging to each family, in relation to the total number of different species, varieties, and indeterminable species in each bed., Figure 2 is a graphic representation of the data in this table., In order to given an idea of the relative abundance of the different families in each bed, a value is assi ned to each symbol in the accompanying chart : ×=5 ○=30, ◎=75, ●=150., Table 3 shows the percentage of each family in the four beds., Figure 3 is a graphic representation of the data in Table 3.,

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