@article{oai:soar-ir.repo.nii.ac.jp:00017649,
 author = {田中,  邦雄 and 寺平,  宏 and 斉藤,  保人},
 journal = {信州大学教養部紀要. 第二部, 自然科学},
 month = {Jan},
 note = {1. The Fossil ripple mark is observed both in the Aoki formation and in the Ogawa formation, of the Middle Miocene; especially most in the middle part of the Aoki formation. 2. The Fossil ripple mark is kept on the surface (upper part) of medium sandstone and covered with sandy mudstone or mudstone. 3. The Fossil ripple mark of this area can be divided into four types. such as I, II, III and IV. Type I and II is current ripple mark, Type III is oscillation ripple mark and Type IV is irregular. 4. The result of the experiments shows that the grain size of which is easy to form current ripple mark, is 0. 25～0. 57mm in diameter. and that this fact corresponds with the size of sandstone which contains fossil ripple mark. 5. The speed of a water-current which is easy to form current ripple mark is 20～40cm/sec, as the result of experiments with water. 6. In order to be preserved in a state of fossil ripple mark, ripple mark is necessary to be covered with mud instantly after the current of water stopped for some time and ripple mark moved no more. 7. The direction of a water-current can be judged from current ripple mark. The Akamatsu formation in Ikusaka mountains was formed by the water-current from between the south-east and the south-west, the Ogawa formation from the east, both the Ishihara formation in Nakayama mountains and the Hirahata formation from the south-east or the south-west, and the Joshita formation in the basin of Dojiri River from the south or the southeast., Article, 信州大学教養部紀要. 第二部, 自然科学 2: 43-75(1968)},
 pages = {43--75},
 title = {長野県中部の第三紀層における化石漣痕についての二，三の考察},
 volume = {2},
 year = {1968}
}