JaLCDOI 10.18926/ESR/13901
タイトル(別表記) Tidal notch cut into the Namigata Limestone, 240m above sea level, Ibara City, Okayama Prefecture
フルテキストURL ESR_7_41.pdf
著者 藤原 貴生| 鈴木 茂之| 前田 保夫|
抄録 The tidal notch and the sea caves which cut into the Namigata Limestone is stiuated in 240m above sea level, Ibara City. The notch assocciates the Namigata Terrace 200m to 240m high. These geomorphological features indicate an event of high sea level. However the age of the event has not been known.
キーワード notch sea cave Namigata Okayama Prefecture
出版物タイトル Okayama University Earth Science Report
発行日 2000-09-20
7巻
1号
開始ページ 41
終了ページ 46
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310395
JaLCDOI 10.18926/ESR/13870
タイトル(別表記) Paleoenvironmental Analyses of the Buried Peat Deposit during the mid-Holocene at the Desaki Coast in Tamano City, Okayama Prefecture, Weatern Japan
フルテキストURL earth_science_reports_011_1_39.pdf
著者 松下 まり子| 佐藤 裕司| 鈴木 茂之| 行基 幸一| 百原 新| 植田 弥生| 加藤 茂弘| 前田 保夫|
抄録 The buried peat deposit was foud in the sand beach on the Desaki coast (Tamano City, Okayama Prefecture), the northeastern coast of Seto Inland Sea. In this study, we performed sulfur and diatom analyses of the deposit. The results were used along with 14C dates and the eruption age (7300 cal BP) of Kikai-Akahoya tephra (K-Ab) to derive sedimentary environments of the deposit. K-Ah was detected just below the peat deposit. At the culmination of the Jomon transgression, the peat deposit had been formed in brackish environments of salt marsh for about 300 years. In order to reconstruct local paleovegetation, we analyzed pollen, wood and plant fossils in the deposit. The results show vegetational transition from a deciduous broadleaved forest mainly of Ouercus subgen. Lepidobalanus to Pinus forest. In spite of the Holocene thermal optimum, the vegetation dominated by Ouercus subgen. Cyclobanopsis was not recognized at the Desaki site, as has been shown in many other regions of regions of western Japan. Ouercus sect. Prinus was replaced by Ouercus sect. Aegilops as the dominant section of Ouercus subgen. Lepidobalanus, suggesting early establishment of traditional rural vegetation of 'Satoyama' in Japan. However, no evidence for human agency has been obtained from the mid-Holocene archaeological sites around the Desaki site. Thus it is more likely that this vegetational transition resulted from the succession caused by natural forces such as ecological disturbance and climatic and/or endemic situations rather than by cultural deforestation.
キーワード Desaki coast diatom remains Jomon transgression Kikai-Akahoya tephra mid-Holocene Paleoenvironment peat deposit plant fossils
出版物タイトル Okayama University Earth Science Report
発行日 2004-12-31
11巻
1号
開始ページ 39
終了ページ 47
ISSN 1340-7414
言語 Japanese
著作権者 岡山大学地球科学研究報告編集委員会
論文のバージョン publisher
NAID 120002310603