@article{oai:soar-ir.repo.nii.ac.jp:00011910,
 author = {多,  里英 and 公文,  富士夫 and 小林,  舞子 and 酒井,  潤一},
 issue = {1},
 journal = {第四紀研究},
 month = {Feb},
 note = {青木湖周辺には,後期更新世から完新世にかけての,おもに河成や湖成の堆積物が断片的に分布しており,下位より藪沢層,崩沢層,神城砂磯層,佐野坂崩壊堆積物,青木湖成段丘堆積物,青木湖底堆積物に分けられる,指標テフラと岩相対比によって,それらの相互関係を明らかにした.佐野坂崩壊堆積物の上位には, Dpm火山灰層がのるとされていたが,それを再堆積物と判断し,周辺の地史を次のように推定した.藪沢層は,比較的広い谷の中を南から北へ流れる蛇行河川によって形成された.その時代は5万年前以前の寒冷な時期である.約5万年前,その河川は狭い谷の中を流れる網状河川に変化した.この堆積環境の変化は, DKP火山灰層を挟む崩沢層と神城砂喋層中部が礫疎を主体とすることにより示されている.約3万年前に,西方の仁科山地で大規模な地すべり崩壊が起こり,佐野坂丘陵が形成された.この崩壊堆積物は川をせき止め,丘陵の南側に深い湖(青木湖)を形成した.佐野坂丘陵の北側の凹地には支谷からの堆積物供給が多く,徐々に堆積されて,現在の神城盆地を形成するようになった., The late Pleistocene and Holocene sediments around Lake Aoki are divided into the Yabusawa Formation, Kuzuresawa formation,Kamishiro Gravel-sand Formation, Sanosaka Debris Deposits, Aokiko Terrace Deposit, and Aokiko Deposits, on the basis of lithology and tephro-stratigraphic correlation. The Yabusawa Formation and its correlatives are mainly composed of silt with abundant plant remains, deposited in a cold period more than 50,000 years ago. They were formed by a meandering river which flowed from south to north as a relatively wide valley. The gravel sediments of the Kuzuresawa Formation and the middle part of the Kamishiro Gravel-sand Formation were formed by a braided river. A giant landslide took place at the eastern margin of the Nishina Mountains and dammed up the river about 30,000 years ago. This landslide deposits made the Sanosaka Hill.The deep depression in the south is Lake Aoki, which has maintained a deep water condition until the present. The furrow in the north of the hill was filled gradually by a large amount of clastic sediment through river streams, forming the Kamishiro Basin., Article, 第四紀研究. 39(1):1-13 (2000)},
 pages = {1--13},
 title = {長野県北西部,青木湖の成因と周辺の最上部第四紀層},
 volume = {39},
 year = {2000}
}