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- Title
Abrupt Late Holocene uplifts of the southern Izu Peninsula, central Japan: Evidence from emerged marine sessile assemblages.
- Authors
Kitamura, Akihisa; Koyama, Masato; Itasaka, Koji; Miyairi, Yosuke; Mori, Hideki
- Abstract
Evidence for abrupt coastal uplifts has been found in emerged sessile assemblages in a sea cave at the southern end of the Izu Peninsula, central Japan. We identified five sessile assemblage zones: Zones I to V, in ascending order. The uppermost zone ( Zone I), located at an elevation of 2.7-3.5 m above the present-day mean sea level (amsl), is a hard massive shellcrust consisting mainly of the barnacles Chthamalus challenger and the tube worm Pomatoleios kraussii. Zone II, at 2.35-2.7 m amsl, is dominated by well-preserved individuals of C. challenger. Zone III, at 2.0-2.35 m amsl, is strongly eroded and consists mainly of C. challenger and P. kraussii. Zone IV, at 1.6-2.0 m amsl, is characterized by the co-occurrence of very fresh shells of C. challenger and P. kraussii. Zone V (the lowest zone), at 1.0-1.60 m amsl, is characterized by the co-occurrence of very fresh shells of Saccostrea kegaki and P. kraussii, and by the absence of C. challenger. Radiocarbon dating by accelerator mass spectrometry ( AMS) and the presence of modern taxa in the sessile assemblages suggest that three episodes of coastal uplift have occurred in the area, during AD 570-820, AD 1000-1270, and AD 1430-1660, with magnitudes of 0.9-2.0 m, 0.3-0.8 m, and 1.9-2.2 m, respectively.
- Subjects
ARCHAEOLOGICAL assemblages; HOLOCENE Epoch; MARINE caves; CARBON isotopes; MASS spectrometry
- Publication
Island Arc, 2014, Vol 23, Issue 1, p51
- ISSN
1038-4871
- Publication type
Article
- DOI
10.1111/iar.12059