仙台市向山地域の仙台層群より産する花粉化石

概要

論文の詳細を見る
The Sendai Group consists of the Kameoka, Tatsunokuchi, Mukaiyama, and Dainenji Formations in ascending order. Among them, the Tatsunokuchi, Mukaiyama and Dainenji Formations are distributed in the Mukaiyama area, Sendai City, Miyagi Prefecture. Pollen analysis was made on the sediment samples of these Formations. The uppermost part of the Tatsunokuchi Formation is characterized by a dominance of Sequoia type pollen including Sequoia and Metasequoia, and they are accompanied by Taxodium and Fagus. The Mukaiyama Formation has a high percentage of Fagus pollen. The frequencies of Sequoia type pollen are higher in the upper part than those in the lower part. In the lower part of the Dainenji Formation, Allnus pollen are dominant, followed by Fagus and Sequoia type. Palaeoclimatic condition in Pliocene time is inferred to have been mild and maritime during deposition of the uppermost part of the Tatsunokuchi Formation up to the lower part of the Dainenji Formation.
2012-09-25