下北半島中部の鮮新-更新統浜田層の地質 <Bull. Natn. Sci. Mus., Tokyo>Geology of the Plio-Pleistocene Hamada Formation in the Shimokita Peninsula, Aomori Prefecture
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The Neogene to Quaternary formations in the Shimokita Peninsula are divided into the Miocene Gamanosawa, the Plio-Pleistocene Hamada and the Pleistocene Tanabu Formations in ascending order. The Hamada Formation varies stratigraphically and horizontally in lithofacies, but is divided into the five members by lithofacies and key tuff beds, that is, the Shijimisawa Sandstone, the Sakaigawa Alternation, the Hatazawagawa Sandstone, the Chikagawa Silty Sandstone and the Okunaigawa Siltstone Members. In this report, thirteen key tuff beds and five members of the Hamada Formation are described, and the Hamada Formation is interpreted from viewpoints of paleogeograph and paleoenvironment based on lithofacies and molluscan assemblages.
- Bulletin of the National Science Museum Ser. C Geology & Paleontology
Bulletin of the National Science Museum Ser. C Geology & Paleontology 14(2), p45-57, 1988-06
National Science Museum