Nov 12, 2018
日本海形成初期のリフト堆積盆地中の湖成泥岩層 鶴岡市
Laminated siliceous shale under an anoxic lacustrine paleoenvironment during the very early stage of the Miocene Japan Sea rift system.
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日本海形成初期のリフト堆積盆地中の湖成泥岩層 鶴岡市
Laminated siliceous shale under an anoxic lacustrine paleoenvironment during the very early stage of the Miocene Japan Sea rift system.
凝灰質砂岩と亜炭層の互層 中新世の日本海形成期の陸上の河川の脇の湿原のようなところで形成 右下に木片の化石
Alternation of volcaniclastic sandstone (grey; resedimented volcanic ash) and lignite (black; low-grade coal derived from land plants). Miocene rift basin in Tsuruoka, Japan. Wood fossil (ca. 30 cm long) at lower right.
土石流起源の乱雑な角礫岩層 日本海形成期の火山のふもとに堆積（1,600万年前）
Chaotic, monomictic breccia deposited from debris flow in front of an active volcano within the Miocene rift basin along the Japan Sea. Tilted to the left.
日本海の冬の荒波に洗われる1500万年前の礫岩層 日本海が最初にできはじめたときのガケのふもとに堆積した地層 山形県鶴岡市加茂
Washed vigorously by winter storm waves of the present-day Japan Sea, this outcrop shows conglomerate beds of a fluvial paleoenvironment origin. These were deposited within the very young proto-Japan Sea which was merely a series of faulted valleys on land at that time, 15 million years ago. Tsuruoka city, Yamagata, Japan.