@article{oai:soar-ir.repo.nii.ac.jp:00011871, author = {Nakazawa, Kenji and Kumon, Fujio and Kimura, Katsumi}, journal = {日本古生物学会報告・紀事 新篇}, month = {Apr}, note = {和歌山県清水町の湯川川下流, 湯川層砂岩よりSpondylus aff. decoratus, Plicatula aff. hanaii, Amphidonte cf. subhaliotoidea, Ostrea sp.などの二枚貝や, さんごCamalophyllia sp.が発見された。二枚貝は宮古統のものに類似し, 時代は古白亜紀とみなされる。厚殻, 付着, 固着性の二枚貝を主体とし, ごく浅い海の環境を示している。これは砂岩の堆積学的研究からも支持される。周囲はやや深い地向斜性の堆積層であるが, このような浅海性の地層の存在は, 海底地辷りによるものではなく, 海水準の相対的変化によるものと結論した。 Bivalve fossils collected from the northern border of the Shimanto Terrain are characterised by shallow marine species, such as Spondylus aff. decoratus, Plicatula aff. hanaii, Amphidonte cf. subhaliotoidea, Rastellum? sp., Ostrea sp. and others, the age of which is considered to be early Cretaceous. The fossilbearing sandstones also show a shallow shelf environment, while the surrounding sandstones indicate turbidity current origin under bathyal environment. The presence of shallow-sea sediments among the turbidite sequence is explained by sealevel change and not by submarine slide of the shallow-sea sediments., Article, 日本古生物学会報告・紀事 新篇. 113:15-29 (1979)}, pages = {15--29}, title = {OCCURRENCE OF CRETACEOUS SHALLOW-SEA BIVALVES FROM THE NORTHERN BORDER OF SHIMANTO TERRAIN, KII PENINSULA, SOUTHWEST JAPAN}, volume = {113}, year = {1979} }