仙台平野下に分布している第四系の地質と植物遺体について
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概要
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The writer has been undertaking stratigraphical and paleobotanical studies of the Quarternary deposits developed under the Sendai Plain since 1950. These studies are based on the data of boring (include deep well) drilled in the Sendai Plain. In this paper he summarizes the geology, paleobotany and stratigraphy of the Quarternary deposits of the same area. Besides, he discusses the stratigraphical relation between the plain and the hills which surrounds the plain. The Quarternary deposits comprise the following formations : Diluvium : Miyaginohara group : Aobayama formation-thickness 30-50m Sendai lowest river terrace deposits-thickness 5-10m Alluvium : Nigatake group : Iwakiri formation (marine deposit)-thickness 10-60m Fukudamachi formation (lake or swamp deposit)- thickness 5-8m Kasuminome formation (flood plain)-thickness 3-7m Plant remains (fruits and seeds) are common in the cross-bedded sandy clay, associated with earthenware and stone implements. The total number of plant species distinguished is 18, representing 14 families. The most important elements of the flora is Fagaceae, i.e., the nuts and cupulas of Fagus crenata BL., Quercus crispula BL., Quercus serrata BL. Besides, the following cultivated plants are discovered along with above cited wild plants : Oryza sativa L. Prunus Mume SIEB. Pisum sativum L. Lagenaria leucantha ROSHY. var. Gourda MAKINO Cucumis melo L. var. Makuwa MAKINO The above cited wild plants are considered to be derived from the mountain region above 500 m above sea level by the Natori and Nanakita Rivers and deposited around the Sendai Plain near the coast. Therefore the Kasuminome formation can be regarded as a flood plain which was formed at the time of the flood of the Nanakita and Natori Rivers.
- 東北大学の論文
- 1960-05-05