岩手県陸中海岸に分布する下部白亜系宮古層群より穿孔性二枚貝化石の発見

概要

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The Lower Cretaceous Miyako Group is distributed along the Pacific coast of Iwate Prefecture, Northeast Japan. This Group is very famous for its abundant occurrence of well-preserved marine invertebrate fossils of various taxa. Lithophaga (Myapalmula) sp. (Mytilidae: Bivalvia) was discovered in a skeleton of hexacoral fossil contained in conglomerate of the Tanohata Formation of this group. L. (M.) sp. belongs to 'lithophagiform' which is functional Glade of boring mytilids. The occurrence of L. (M.) sp. indicates that subgenus of Myapalmula appeared from the Early Cretaceous onwards. It is inferred that L. (M.) sp. was dead coral borer. The occurrence of L. (M.) sp. supports warm sea during sedimentation of this Group.
日本古生物学会の論文
2008-10-01