北海道樺戸郡新十津川地區の地質

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概要

• 論文の詳細を見る

• The Shintotsukawa District occupies the eastern margin of the Kabato massif in western Central Hokkaido and lies to the west of Takikawa Town, the type locality of the Pliocene Takikawa faunule. The greate part of this area is a broad hilly country, 200 meters in altitude and bounded by the Paleozoic Kumane-shiri formation on the south. The whole area consists of Neogene rocks, which are subdivided by the writer, as shown in the annexed geologic column, into the Nishitoppu, Shintotsukawa and Oshirarika groups from the lower to the upper, by two nonconformities. The lower two groups consist largely of siltstone while the upper is largely of sandstone very rich in pyroclastic material. All of the horizons have yielded numerous fossil Foraminifera and Mollusca, by which this area becomes a good region for the establishment of a standard faunal sequence to the oil-bearing Tertiary of Hokkaido. The hitherto known Takikawa faunule is largely increased by the writer's collection of molluscs from the Oshirarika group. The unconformity at the base of the Shintotsukawa group, first confirmed by the writer in this area, may be correlated with the unconformity below the Togeshita formation in the Rumoi area and below the Wakkanai formation in the Tenpoku area. These mentioned areas are situated to the north of the present district. Since the Neogene formations studied consist of sediments deposited in a geosynclinal basin known as the Ishikari geosyncline, each formation contains varied lithofacies near the southern margin of the geosyncline along the Kabato massif owing to fluctuation of sea-level.

• 東北大学の論文
• 1953-03-31

著者

• 今西 茂

  熊本大学理学部

• 今西 茂

  熊本大学理学部地学教室

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