文献一覧: 一瀬めぐみ (著者)

2 0 0 0 IR 熊本県南西地域の白亜系宮地層とその分布

著者: 田中均高橋努田代正之加登住誠本多栄喜一瀬めぐみ
出版者: 熊本大学
雑誌: 熊本大学教育学部紀要. 自然科学 (ISSN:04546148)
巻号頁・発行日: vol.57, pp.7-17, 2008-12-19

The Miyaji Formation typically exposed along the coast of the Futami area, Kumamoto Prefecture, is characterized by sandy facies in the lower part and muddy facies in the upper. Abundant shallow marine bivalves are usually developed in the several horizons of the lower part. Among the identified species, Pterotrigonia (Pterotrigonia) pocilliformis, Goshoraia minor, Anthonya monobenses are the most diagnostic. From the bivalves faunal aspects and lithological character, the formation is comparable to that of the Lower Hibihana Formation of the Monobegawa Group in Shikokku. Detailed geologic survey has led to the discovery of the Miyaji Formation except for the type locality. The distribution of the Miyaji Formation offers the key to an understanding of the structural movements in this region. The Miyaji Formation is cut by several NW-SE faults. Judging from the field evidence, these faults can be determined to be associated with the geological structure of the Amakusa Islands

2014-02-11 11:18:07
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https://ci.nii.ac.jp/naid/110006991111

2 0 0 0 IR 大分県津久見市無垢島の上部中生界と二枚貝化石群集

著者: 田中均高橋努一瀬めぐみ坂本大輔林智洋本多栄喜
出版者: 熊本大学
雑誌: 熊本大学教育学部紀要. 自然科学 (ISSN:04546148)
巻号頁・発行日: vol.56, pp.61-70, 2007-11-30

Mukujima Island is 16 kilometers northeast of Tsukumi City, Oita Prefecture, and is geotectonically occupied by the Chichibu Terrain of the Outer Zone of Southwest Japan. In this area the Upper Mesozoic strata are exposed in Jimukujima and Okimukujima Islands, and are lithostratigraphically divided into four formations, i.e. Mukujima, Jimukujima, Okimukujima and Bungo Formations in ascending order. In this paper, the stratigraphy is described in some detail, with remarks on correlation, and the features of the bivalve faunas are made clear. The Mukujima Formation, about 65m thick, is characterized by the predominance of feldspathic quartzsandstone. Several shallow marine bivalves which were conspecific with the bivalves from the Torinosu Group in Sakawa, Sakamoto, Yatsushiro and Tanoura areas, and Soma Group (Nakanosawa Formation) in Soma area, and the fragmental plant fossils occur from this formation. From the faunal aspects and lithological characters, the Mukujima Formation is best comparable to the Torinosu Group in Shikoku, and is assigned to the Late Jurassic. The Jimukujima Formation about 550m thick is in fault contact with the Mukujima Formation. The formation is characterized by the frequent occurrence of red-colored rocks, with intercalation of brackish-water shell beds. From the fossil-contents (Ryoseki fauna) and lithological characters, the formation is comparable to the Ryoseki Formation of the Monobegawa area, the Koshigoe Formation of the Haidateyama area, the Togawa Formation of the Gokase area and the Kohara Formation of the Yatsushiro area.