The , sometimes in older literature the Tenneru Conglomerate Member of the Chorobetsu Formation, is a geological formation in southeast Hokkaidō, Japan, in the area of Kushiro. Deposited between the Harutori Formation and Yūbetsu Formation in the Urahoro Group that unconformably overlies the Nemuro Group in the Nemuro Belt, the Tenneru Formation correlates with the Rushin Formation at its western end. The Formation, laid down in the Late Eocene, consists mainly of reddish and reddish brown conglomerate, with some sandstone and mudstone; there are several intercalated coal seams. New species of fauna described from the Tenneru Formation include the "Kushiro tapir" [ja] (Plesiocolopirus kushiroensis; protonym: Colodon kushiroensis), and of flora, Actinidia harutoriensis, Alnus ezoensis, Aralia ezoana, Cordia japonica, Cupania japonica, Idesia kushiroensis, Lastrea kushiroensis, and Maesa nipponica.
Flora The Tenneru Flora as described by Tanai Toshimasa in 1970 from the areas where the Tenneru Formation is exposed, with a thickness of some , along the upper stretches of the in the western , comprises sixteen families and twenty genera, including two Pteridophytes, one Equisetum, and two conifers, the remaining species being dicotyledons:
Family: Osmundaceae Genus: Osmunda Osmunda sachalinensis Family: Polypodiaceae Genus: Lastrea Lastrea kushiroensis Family: Equisetaceae Genus: Equisetum Equisetum arcticum Family: Taxodiaceae Genus: Glyptostrobus Glyptostrobus europaeus Genus: Metasequoia Metasequoia occidentalis Family: Aceraceae Genus: Acer Acer arcticum Family: Actinidiaceae Genus: Actinidia Actinidia harutoriensis Family: Alangiaceae Genus: Alangium Alangium basiobliquum Alangium basitruncatum Family: Araliaceae Genus: Aralia Aralia ezoana Family: Betulaceae Genus: Alnus Alnus ezoensis Family: Boraginaceae Genus: Cordia Cordia japonica Family: Cercidiphyllaceae Genus: Cercidiphyllum Cercidiphyllum eojaponicum Family: Flacourtiaceae Genus: Idesia Idesia kushiroensis Family: Myrsinaceae Genus: Maesa Maesa nipponica Family: Platanaceae Genus: Platanus Platanus aceroides Platanus guillelmae Family: Sapindaceae Genus: Cupania Cupania japonica Family Ulmaceae Genus: Planera Planera ezoana Genus: Trema Trema asiatica Genus: Ulmus Ulmus harutoriensis Genus: Zelkova Zelkova kushiroensis
See also Kushiro Coal Mine Kushiro City Museum
References