The lower half of the Paleogene in the Ishikari Coalfield in Hokkaido is the main part of the coal-bearing seam. It is 800m thick in the Yubari Coalfield in the south and 2400m thick in the Sorachi Coalfield in the north. It is made up of continental and marine deposits, and the shell fossils in the marine deposits are called the Ishikari Fauna, and indicate a climate change from subtropical to temperate. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
北海道石狩炭田古第三系の下半部で,夾炭層(きょうたんそう。→炭層)の主要部。南の夕張炭田では厚さ 800m,北の空知炭田では 2400m。陸成層と海成層からなり,海成層の貝化石群は石狩動物群と呼ばれ,亜熱帯から温帯性の気候変化を示す。
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