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Significance of high-energy event deposits found in the geological investigation of archaeological test pits on Heping Island, Keelung

Abstract: In order to look for the Spanish buildings on Heping Island, Keelung built in 1626, archaeologists excavated seven archeological test pits there recently. Each test pit had similar accumulative layers and succession (Unit 6 to Unit 1, in ascending order). It is worth noting that an erosional surface was found between Unit 3 (which contained marine bio-clasts) and Unit 4 (Qing Dynasty culture layer). The purpose of this study is to investigate the factors contributing to the formation of Unit 3 and its age. Unit 3 was found to contain matrix-supported to grainsupported fabric and marine bio-clasts, which suggest that Unit 3 came from marine and was transported by high concentrated flow. Although occurrence of Unit 3 could be compared with modern storm surge deposits and tsunami deposits, marine meteorology and landform data in the Keelung area suggested that storm surge and tidal surge could be blocked by the landform of Heping Island. As mentioned above and from the dating results, this study suggests that Unit 3 was deposited by an extreme storm event or tsunami event. If Unit 3 was due to a tsunami event, it might be the Keelung tsunami event on December 18, 1867.

 Fuente: Western Pacific Earth Sciences, 2018, 15-18, 1-18,

 Editorial: Geological Society in Taipei; Institute of Earth Sciences Academia Sinica

 Año de publicación: 2018

 Nº de páginas: 18

 Tipo de publicación: Artículo de Revista

 ISSN: 1609-901X

Autoría

CHUANG, CHAO-MING

SHEA, KAI-SHUAN

LU, SHIH-TING

TSANG, CHENG-HWA

BORAU MATEO, JOSÉ EUGENIO

MARÍA CRUZ BERROCAL

CHEN, PO-TSU

LIU, YEN-CHIU

ELENA SERRANO HERRERO

CONSUEGRA RODRÍGUEZ, SUSANA

GENER MORET, MARC