Comparison of the Poronai Formation in the Ashibetsu District with that in the Yubari District, Ishikari Coal Field, Hokkaido
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概要
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Recently, the Poronai formation (which develops) in the Kamiashibetsu district in the northeastern part of the Sorachi coal field has been correlated by some geologists with the upper-most part of the same formation in the Yubari coal field, on the basis of foraminiferal fossils.<BR>But, the writers are inclined to believe that the former should be correlated with the lower part of the latter, according to the mega fossil assemblage and lithological features (examined).
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